How to stop being shy with ur best friends and girls they talk too.?

I have a lot of friends, but at lunch i barly talk unless spoken too. they sit there and talk and im just sitting their being quiet

when i walk down the hallway in school i walk with my friend and he talks to some girls i never speak a word or anything i just trail behind over their shoulder's and try to think of something to say...

i hate this any good way to overcome this? this is rly startin to annoy me :(How to stop being shy with ur best friends and girls they talk too.?
imagine that you're just around family. you're not shy around your family, are you? besides, if you show your true colors and what a great person you really are, you'll probably gain a lot of friends from it! if you're afraid of being put down for showing who you are, then that's those jerk's problem. not yours. if they can't handle your awesomeness, ignore them. they don't deserve it anyway. ;) in short, just don't be afraid, and go for it!!! Good luck and GOD BLESS!! =)