How do i get rid of stretch marks?

I'm a 17 year old black female and I'm kind of over weight! I have horrible very black stretch marks all across my stomach (they look like jason clawed the crap out of me) and underneath my arms and on my backside up above my and on my thighs..actually ever where where fat can hide its ugly self..SO i need to know is there a way to get rid of these ugly things for the summer?