what is the quickest way to lose weight?

hi! so i’m a 15 y/o girl and to say it in a way that’s straightforward, i’ve never been able to get the attention of girls or guys. Since im in high school a lot of my friends have boyfriends and exes and no boy has ever taken interest in me. all of my friends are absolutely gorgeous and i can’t help but notice that im not as skinny and pretty as them. boys always seem to like girls who are skinny. So i’m wondering what the quickest way to lose weight is because i do not want to go through all of high school without any guy talking to me! (ps i hope this doesn’t sound like ‘pick me’)