Have you recently undergone a growth spurt? (Not to be crude, but in any direction - upward or round-ward?) If so, then given your age they probably are adolescent stretch marks. For many people they will fade, though not disappear, over time.
If you're interested in treatment, I'd recommend you see a dermatologist. Sometimes they can prescribe Retin A to help; other times laser therapy can reduce the appearance. A dermatologist can also determine whether you are doing anything to aggravate their development. (For example, some steriod medications can worsen stretch marks.)
Most importantly, a dermatologist can rule out less likely, but more problematic, conditions that have similar symptoms.
Good luck!
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