Why do you think certain people get laughed at or bullied?

Ive been a social butterfly all my life. I did what i wanted, asked out boys (always got rejected) i realized a few years ago that i didnt have much self awareness. My best mate from high school said every guy wanted me but no one asked me out. But now that im older i get tons of guy attention but the girls HATE me.
I realized i had a friend that was connected to everyone else and the "friends" i made that were girls secretly hated me for some reason. I didnt sleep with no ones boyfriend or anything so i dont know why im singled out and made fun of