Boyfriend Issues

So im not exactly "skinny," have a little fat here and there but i get crazy stretch marks and am sooo self conscious of it. my boyfriend is like a twig (skinny as all hell) and we dont have sex but tease a little bit, and when he pulls down my pants i get nervous bc of my body... even though he says he loves how i am and weve been dating for 2 years i cant feel completely comfortable around him... 😔😭