Well I weigh 96.8 lbs and I have stretch marks on my thighs I noticed them last year. Ive never been overweight and I dont understand why I have them. I do track and dance and other sports could it be from muscle gain? Im feeling a little self conscious about how I look in a bikini or a swim suit because of the stretch marks. Please help! and if theres anyway to get rid of them let me know!