I'm a young guy with stretch marks?

DaveyYourFavey
I have stretch marks at the top of the inside of my right arm and a lot at the top of my thighs, mostly at the back. They're sort of purple and dark in colour and I've noticed them ever since I was 15. Will they ever fade? Would it turn girls off? Is it strange that I have them so young and that I'm a guy? Is there anything that I might be doing that might be causing this?
Updates
+1 y
There's some on my ass too * :(
I'm a young guy with stretch marks?
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