Tanning for stretch marks is very far fetched:
Some swear by using indoor tanning as a way to make stretch marks blend in better with tanned skin but this couldn’t be further from the truth. The reality is that stretch marks are located in the middle layer of skin and contain its own pigmentation (color). Stretch marks don’t actually tan, which can make them stand out more against your tanned skin.
What does work in some cases is the use of self tanning products (tanning lotion, fake bake tans, etc) because these actually create a layer of pigment that sits on top of your skin. But the results aren’t always guaranteed. Remember, tanning under the sun or in a tanning bed is bad for your skin anyway so avoid it if you can!
Stretch marks don’t mean you can’t be a model:
Just because you have stretch marks doesn’t mean you can forget about pursuing a modeling career. It all depends on what kind of modeling you want to do. If you want to become a swimwear model but have really bad stretch marks all over your butt, stomach or breasts, then you may have a difficult time breaking into that field.