Streatch mark

I just recently got stretch mark on the inside of my tigh...should i be proud of them? Im also like 150 or 160 lbs and only 15 and im 5'3. Is that bad idk im starting to like my body but i dont know anymore edit:forgot to mention im in dance class and i really really hope that i loose alot of weight i want to be happy with who i am yet i eat disgustingly ive started to run with my dogs and drink less sodas (i dont really drink any anyways) and be a healthy and responsible teen