What's the best way to get rid of stretch marks? should i go to a dermatologist and get a prescription? or is it a waste of money?

Depends on cause.: If they are due to applying strong topical steroid creams, you need to stop the steroids. If they are due to an underlying hormonal problem, you need to address that. There is no magic wand for stretch marks, you have to look for the cause and address that.

Start with GP: This is a problem that requires a face-to-face meeting with your doctor. In that meeting, your doctor will listen to you, perform a throrough examination and possibly order labs or other tests. Based on this information, he/she will be able to tell you what's wrong and what to do about it.