I need help, boy trouble?

I'm what you would consider a major nerd in high school but i have a huge problem with boys. I don't like the fact that so many of them come up to me it's annoying and when i try to tell them off it doesn't work because I'm a girl and all that crap. I've tried everything,telling them i was gay, that i had a boyfriend (which i don't want for the time being) going to school in braids because my hair is long any thing to get them off my back. I thought being nerdy would help me out this time but it didn't . I have to go back to school to help those failures for summer vacation so i can put in for some community services but i don't want to deal with those dog's what should i do?