Hello, (имя кому ты пишешь)
Don't worry. I know resolving of your problem. The most of teenagers and even some adults have same problems. Shy behaviour is not so bad as you think. But you have to be more close and sociable if you want to have more friends or just at communicating with people. First, find themes for talking with people you talk easy and be more free. Second, try to join the conversation and you'll see how fast your modesty will gone. I hope these advices will help you. good luck