Unfortunately, there isn't anything you can really do about the stretch marks, but over time they fade. I think your weight is fine, your probaly going through a growth spurt, and your height should catch up with your weight. Just try no to gain much more. If your worried about your tummy sticking out, you can try doing some cardio and situps to tone up, and lose the fat. Don't worry though, I'm sure you look great. If you want to chat or need any other suggestions or support you can email me starsharp16@yahoo.com