I am 7st 10 pounds I am 18 is that big for my age I have a belly and I feel fat

Want a boy friend but boys only like size 2 girls

That's quite small. I have a friend who's almost 13 and she's 8 stone and she's not fat.

Don't consider any boy who can't accept and like you exactly the way you are. Bending yourself into the shape a guys wants you to be leads to hurt feelings. It's not a happy way to be.