Smile. :) Don't be afraid to express your emotions and actions of whom you really are. Embrace your interests.. If there's a sport or hobby you've always wanted to be good at, now's the time! Be thankful of what you have. :)
Make a list of why your so awesome:). Keep it where you have easy access and pull it out whenever you need a pick me up! Surround yourself with people who love you for who you are, overcome your shyness and just go for it!
Shyness is a reflection of self worth. To overcome your shyness you must first first realize that you are worth getting to know. Most people will find your life stories fascinating, mostly because they are different from theirs. When you listen to other people's stories you probably find them interesting, right? Why? Because they are different from yours. Like computers, we need input to work properly. They need your input as much as you need theirs. You are helping them grow by even just saying 'Hi'... input. In most cases they want you to start the conversation (input), so they can join in. People want to be around, and flock to people that make them feel good. Start conversations with "I'm so glad you're here", or "I missed you". Always use people's names when you talk to them, it's like honey to their ears. And NEVER talk bad about other people even if they start it! People know if you talk bad about other people you may be talking bad about them. Just tell them "I'm sorry I don"t talk about people behind their backs." You will have an instant friend!
I am really shy too but lately, I figure its not worth it to be so caught up in what others think, I say what's on my mind, do what I feel like doing, and while doing this I've found that I have grown a lot closer to some people who are now some of my best friends! Don't think too much just act weird. But not too weird ;)
There is a sure-fire answer to your question!!!! Buy the book "How to Win Friends and Influence People" written by Dale Carnegie when your parents were kids. It still sells almost as many copies each year as the Bible, because it HELPS develop your confidence. More than that, this book tells you in detail what to say and how to respond in almost every situation of life. It transformed my life and those of my two daughters. Which is why we gave a copy to our grand-children at their last birthdays.... Most bookshops have it, Amazon sells it for $15 and your library may loan you a copy for free!