How to make my a little smaller or stay the way it is?

Well first off your diet sounds awful. It really doesn't matter that your metabolism is fast because you are still getting fat in between your organs that doesn't show. Secondly, it sounds like you have a really amazing body. You probably got hips and a from puberty, and this is something normal.Do squats and lunges to tone your more but i wouldn't worry about it being too big, the guys will love it!