Whatever you do, if you are really nervous around her do not start talking to her because you will start talking stupid stuff and we want her to think you are smart right. Lolol just pulling your leg here. Just be yourself and don't worry.
You've like a girl for ten years? and nothing has happened, were are your balls mate ?
Do you want her to yours ? or just a friend.. you want her more by the sounds of it, so be a man and make the moves
Flirt a little, make her feel special, be brave, what have you got to lose sweetie ?
You will be stuck in the friend zone and it's hard to get out of that :)