I suppose the fact that you are a good or a bad mixer is determined only by your character. I partly agree with Torra that communicative skills are formed in early childhood in most cases as well as all other sides of our character. Childhood is a crucial period for forming the character. However I have seen some cases when absolutely shy and tight-lipped teenager turned to be a good mixer and life of the party. I know that you can change any part of your character consciously if you are able to fight with your hang-ups.

It is already well-known fact that people are divided into 2 main psychological types of social behaviour: extroverts and introverts. And this cannot be changed. The founder of this theory Carl Gustav Jung believed that extroversion and introversion are innate characteristics having physiological basis. Scientists of our time have confirmed the correctness of his intuitive guesses. He argued that the best way we can adapt to this world is moving along from introverted to extroverted end of the spectrum when we need it. According to Jung, it is quite normal if you are somewhere between an introvert and an extrovert. However, we are always drawn to one direction more than to another. Therefore, though there are few “pure” introverts or extroverts, we are have inner temperament that we have to take into account and not to alter yourself by force or to satisfy the society. Everyone has his comfortable place where we live in society best.
Jung believed that the child would suffer significantly if in the process of education he is will pushed beyond his natural limits of temperament. He called this “an abuse of innate predisposition of personality”. This can lead to mental illness.
The main thing that help us to distinguish between an introvert and an extrovert is a source of energy. The extrovert gets energy from the outside world: actions, other people, places and things. Long periods of inactivity, being alone with his thoughts, solitude or communication only with a single person make their lives senseless. Nevertheless, it is necessary for extroverts to alternate the time when they are particularly active, with intervals of just being, otherwise they will be lost in the whirl of feverish activity.
Instead, the introvert likes to muse and to imagine. Sometimes they say that the introvert’s additional features of introvert are shyness and permanent tranquillity. In addition, the introvert is considered to have poor ability to communicate within the society.
No wonder that extroverts find it difficult to communicate with people who do not need many aspects of the external world, and, accordingly, are not interested in it fully. Generally speaking, an introvert is a “person in a box”. However, it is a cozy and beloved box where the introvert feels comfortable.
The basic differences between introverts and extroverts are as follows:

An extrovert:
- loves to be in the thick of action;
- Likes variety, the same thing make him bother;
- gets acquainted with many people, and considers them friends;
- chats with pleasure to other people, even to strangers;
- gets energy from an action, grabs the next work;
- speaks or acts without first thinking;
- usually it is a person full of energy;
- is more inclined to talk than to listen.

An introvert:
- prefers to relax alone or in a small circle of close friends;
- thinks that friends are only those people with whom he has a deep relationship;
- needs a rest after some activity, even if it was fun;
- seems to be calm, balanced, likes to watch;
- ss a rule, first thinks and then speaks or acts;
- feels drained, being in a group of people or in a state of stress;
- does not like to feel overworked.

I am pure introvert and it is really hard for me to communicate with people all the time. I love calm, spacious places, where everyone has his own territory and does not claim to his neighbor’s one. Trying to start an empty talk I also consider as invasion of my personal territory. This is waste of my unique time and my personal energy.
That does not mean I afraid of communication. No. I like to talk with my family, my friends, my beloved people. I feel happiness and pleasure during the talk with them, but talk for a simple talk without subject with some foreign man is not for me. During such kind of communication I feel I am losing my energy, I feel myself forced and very sad.
So communication without a subject is not just a nice opportunity for spending time. Some of us do not need it and try to avoid it if possible. I am one of them.

There are a lot of people in our world who do not like to communicate with others. Of course they are doing it from time to time, but try to avoid it if it is possible. I am writing about introverts- people who feel comfortable themselves alone or with a small number of friends.
Extraverts adore communication, because they are getting energy from in that way. Introverts just lose it during the communication. They perceive undesired interlocutor as an aggressive vampire, who wants to steal their priceless energy. Introverts feel themselves very comfortable absolutely alone. They really need loneliness and do not suffer of it. They generate energy during this silent time, they are thinking a lot and sometimes can imagine something really genius if they have enough time for being alone. A lot of great musicians, famous writers, excellent doctors and a biggest part of IT specialists are introverts.
Introverts are the best friends in the world. It is very hard to become his friend, but if you could do it, that means you have a person who will do anything for you. Introverts adore their friends. They have a very little number of them, but they all have a really great meaning in their lives.
It is very hard for them to leave their cosy bubble of energy and start to talk with some unknown person. Introverts know that just will lose energy during such kind f communication and will need a lot of time to restore it. Often they are very sensitive people and react instantly if someone has a bad mood or feels pain. Introvert can not ignore these feelings and usually starts feeling the same.
Thanks God, we have Internet and email nower days. Such kind of communication gives opportunity to introverts to save their energy and resolve a lot of important problems without live communication.
Introverts are not rude, shy or surly. They just know price of unnecessary communication and try to avoid it. At the same time communication with the right person can make them shine and feel like the happiest person in the world.

Talking about communication Martin Luther Kingsaid:

Today television (or Internet) fill all people's free time. They no longer communicate with each other. Increasingly, they no longer come together in order to socialize, spend time with each other, but to sit down near TV together ... in silence. To tell the truth this is where communication flows in their estrangement.

I often hear that the Internet is killing real communication. No! It does not kill communication at all, and even it helps in communication between people. Internet communication is also a real communication with real people, who don't not personally with you at this moment. But anyway I can feel their soul and spirit very well, and most of people feel and understand me as well. And as it turned out, it is much better to communicate via Internet than by regular mail. If for no other reason than because it more speedy. 10-12 years ago a lot of people claimed (and is was in mass media) that the Internet and e-mail were not communication tools, and they were wrong. I've seen and made ​​sure that things are different! I do not exaggerate, comm with the best of the new found friends always gives me positive energy! I feel the urge to meet some of them personally, to visit most beautiful and interesting places that my friends told me about. I likes showing and commenting their great and sometimes even unique photographs. I think the main thing is how to communicate.