HELP ME PLZ

I've never been so self conscious with my body in all my life - I'm covered in stretch marks on my arms, stomach, thighs and under my knees. I am dreading for summer and don't know what to do. I can not seem to lose weight even tho I try so hard. I used to eat healthy and exercise every single day for a couple months and then I didn't get a big enough result I would have liked so I got all depressed and stopped. I've taken skinny pills, vomited, starved, dieted, legit everything but I just am never happy anymore and it's come to the point where it's affecting my school life and my emotional and social health