does anyone else struggle with jealousy?

before I yap, I just want to say that I am not a mean person and I would never hurt anyone out of jealousy. these feelings are my own and it is not anyone else's fault.

I feel like a horrible person sometimes. I'm insecure (especially regarding my appearance) and I can't stand when someone is better at something else than me if I care about that thing. I know girls who are practically the ideal girl: everyone finds her pretty, everyone likes her, she's sporty, she does well at school, she pulls boys, etc. whereas my grades are just good and not excellent like hers. I'm basically nothing else. and then I just feel inferior. it's my own fault and I in no way wish harm on her, but why is everyone else doing so well in comparison to me? and I know everyone has their own struggles but it still hurts. it hurts to see people laughing with their friends and ignoring me because everyone is already friends with each other. it hurts to see people excelling at things when I put in so much effort just to be mediocre. it hurts to see girls talking about how pretty another girl is when I struggle so much with my body image to the point I throw up and cry almost every day. it's so unfair. what the fuck is wrong with me.