Is it normal to feel this way?

I’ve never been very confident, especially when it comes to my body and always rejected everyone who tried to date me because I was afraid of getting hurt. I’m a really introverted person and my self esteem isn’t the best. But I’ve been with my first real boyfriend for 7 months. I’m not a jealous person and not the kind to snoop around, but him following and liking girls pictures on instagram makes me feel really shitty. I don’t mind him following girls, it’s just that type of women who post their asses and tits all over the place. They’re that kind of huge ass small waist huge tits type of women that you see everywhere now and that just makes me feel even shittier about myself because I know I don’t look nowhere near as they do. Because of this I kinda push him away when it comes to sex and I prefer to do it with the lights off so he can’t see my body. I don’t wanna look crazy by asking him to stop following and liking their pictures, but is it normal to feel this way? To let social media and those attention whores affect my self confidence? I constantly compare myself to them and I sometimes wanna break up with him so he can find someone better