Why do guys laugh at me?

Anonymous
Why do guys laugh at me when I walk past them. Its mainly guys in high school up to freshman in college. I know I'm not ugly. Nobody is ugly everyone is beautiful. So, why is it that guys around that age laugh at me?
Updates
+1 y
Its usually random guys. I know some by seeing them around but I don't talk to them.
Why do guys laugh at me?
3 Opinion