I NEED HELP FOR THE SUMMER!!!!!!!!!!!!!!!!!!!!!!!!…

ok so im going to be in 7th grade next year JUNIOR HIGH!!!!!!!!!!! i cant go to junior high fat now im not going to say my weight but im FAT!!!!!!!!!!!!!!!!!!!! all my friends are so much skinner! and what can i do to lose weight and NOT gain mussel because i want to lose weight not gain weight and it sucks because when i look at the Number game on facebook a cute boy i like say everyone is hot and he said i was ok but all the people he said was hot are skinny and i would be pretty if i lost a little weight i mean im not fat or any thing but im fatter then every one else and i need a diet plan to and im only 12 so a excises plan would be good pleas pleas answer me please and don't say your to young or any of that because i don't care about that!!!!!!!!!!