Self confidence

Hey guys, I'm 17 almost 18 and struggle with extremely bad self confidence issues because of my families views of what you should look like (which I am not what they think a woman should look like) and years of bullying. I am gonna be a senior and my bf of 2 years tries to make me feel better because he knows that I struggle with my looks. He is extremely helpful but I still put myself down. I also used to be much thinner because when I was bullied freshman year j developed an eating disorder but after the bully left I gained weight, my bf always tells me he prefers me like that cuz he loves me just the way I am ( he always mentions that he likes my ass and boobs too lol). I have lots of scars and stretch marks super bad(my bf also loves my stretch marks cuz he says that they tell a story and show that I am a real woman) , so I am ashamed to show my thighs. Sorry for the super long story but any tips to maybe help?