Is it a bad idea to tan if.....?

Okay, well.. I'm pale and I hate it lol. I really want to go tan. But, should I wait? because I used to be kind of chubby, and i have stretch marks on my body from it. -_- I lost all that weight and I'm skinny again but they're still there from it. ): i also have a scrape on my arm and leg because I fell while outside. <_> is it a bad idea to tan if i have stretch marks and them scrapes lol? because I have the apportunity to go do it tomorrow. But i'm afraid if i tan with the stretch marks everything will come out uneven and weird looking lol. And because of my scrapes that it wont tan those spots, so when they go away it wil lbe light there, while the rest of me is tan. <_> What should I do...?