I want to be a girl not a guy?

i wouldn't worry about that because those are things that you can outgrow as you get older so yeah you may feel out of place now but things can change as you develop but if you feel you would be better with a sex change, then go for it :) you will learn how you are as you grow older so at 15, try not to worry too much, it'll all workout for your good in the end.