...bad stretch marks at 19...?

well im 19. I use to have an eating disorder and was a size 2 at 5 foot 10. but I gained a lot of weight and am now a size 9-13. and well...my thighs and breast have really bad stretch marks.my thighs. butt and breast is where I gained the most weight I have a 30 inch waist. but what are the best ways to get rid of them or at least fade them...please help. I have a party coming up where im going out of state to see family members that I have not seen in a while and one of my outfits for the main day is a lower cut shirt. with one of those longer flowy boho kind of skirts. please help??? its in about 1 month!