Help Please!!!

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I had to lie to get on this web site yes i feel bad but iam more mature than most teens my age. I am acctually 15 and I am really over weight and need help. I am doing a tumbling class which is also gymnastics but i tried out for cheerleading at the same place thinking what the heck i will do it just for the fun of it! But i made it which is great tooo!!!!! But my little problem is it's an allstar team which means uniforms are short for the skirt and the top is from below your boobs to your neck with long sleeves. And my problem is that i have stretch marks and i jiggle plus i cant ask friends to help cus i dont have any b/c of my weight and my old friends are now friends whith someone that bullys me about my weight. So can you guys help be my pal on MFP cus i have no were to turn to help with motivation and to help with stretch mark issues? You would be of great help! (and no bad words as comments i dont do or like language) :)