Will things get better?

Right now im really confussed and depressed. this may seem like a really stupid problem to people if your older then me, but trust me it is really complicated. im going into seventh grade and need opinions and advice. in k-4 grades i was very popular and then in fifth grade i had a spinal fusion (back surgery) and was gone most of the school year. when i came back in sixth grade i was not as popular (my grade school is k-6). im still friends with all the popular girls but now i hang out with the popular but not as popular girls more. right now i have very low self asteam and act quieter probably because im insecure about my weight i gained some weight after surgery because i had to stop all phsycle activity and was stuck inside during recovery and people brought me a lot of food and stuff. this summer i am going to and im in the process of loosing that weight. Everyone says im really pretty people even say im prettier then the "it girl" but most guys don't notice because they only like skinny girls. please don't say im to young for a boyfriend because i kinda agree but everyone has a bf so yeah i want guys to notice me more i have guy friends but thats different. all my friends have bf or had one before except me. i don't know if this makes a difference but im considered the richest girl at school. so im asking if u think ill be popular if i have a better attitude lose weight am nice to everyone and throw partys at my country club but don't act stuck up and if i don't care what other people think and i just do what i like. please be honest and sorry i know this is really long