So jealous

Is it just me or does everyone else feel super jealous when they see their bf/gf has liked a picture of a really attractive girl. I would never ever tell him that because I know it's so pathetic but why do I feel like this??? I'm a pretty girl but I cant stop thinking about how much prettier all these other girls are on instagram. I've become obsessed with trying to lose weight, I want all these cosmetic procedures done etc. I've never been so insecure before. I used to be really self-confident but lately I cant stop looking at all these perfect girls on Instagram and wish I looked more like them 😔