Comparing myself to my bfs past interests.

My bf and I have been dating for over a year now. I know he loves me and only me but I can’t help but compare myself to some of the girls he used to like. There’s 3 of them that I always kinda check on their Instagram pages to see what the post and stuff. They’re all really pretty and I feel super low compared to them. I’m not very photogenic or anything and I don’t want to seem like I’m trying too hard to look good. Please help