I'm too quiet and therefore boring?

[imreallysad]

I need some help.
I'm fourteen and very shy at school, so I don't say much especially not around popular people. There are a few friends that I have that I'm not close with and don't intend to be, but that I seem to talk to really easily and they sometimes find what I say to be amusing. But around most other people I don't say word because I don't know what to say, and they obviously find me boring and have every right to.
I try to just be a good person and not interfere with people's conversations, and I do people stupid favours in the hope that they'll like me even though I know that's not how you make friends and will not work. I get depressed so much over this because I know that I only get one life, and friends are a very important thing to me. I just don't have any close ones. Seeing people that are so close and laugh with each other gets me really down because I so want to be like them, but I'm rubbish at carrying on conversations and I'm very socially awkward. please help