I'm a 15 year old girl with stretch marks on her ass? Is this normal?

Anonymous
I'm embarrassed because I have stretch marks on my ass cheeks:/ I'm not sure why?

can someone give me some reasons why I may have them.

additional information: I'm skinny//underweight (don't know the exact weight)

and I'm 5'3

please help it's highly embarrassing...
I'm a 15 year old girl with stretch marks on her ass? Is this normal?
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