How to not get jealous of people, just graduated?

I just graduated high school, and theres a girl whos like a slut andd partys all the time, and everyone at my school who are just blah. i hate everyone. after graduation today a girl uploads a picture of a brand new Dodge charger, and says "my graduation gift", and i realize that i got nothing at all from this, my parents wont even buy me a 40 dollar skateboard, i get jealous too easily, every single person at my school gets brand new cars like that and i realize whats the point, they get everything for free and it really is bs, like a 30 grand car for graduating highschool? if i worked since i was 15 i couldnt even afford a dodge charger. its ridiculous im going crazy, and realize that it doesnt matter seeing as i can kill anybody in this life before i die (i wont actually do it LMAO!) and i jsut realize that insurance and gas for that alone will be alot more then an 18 yo can afford. i just get so pissed, and i dont even know what im doing after highschool so imreturning. people just get everything for free and its ridiculous, like cmon a 2011 dodge charger for a girl?