How old are you aprox? Its quite possible that its maybe the way your dress??? If not it maybe something alittle more serious. I would speak to a school counselor or social worker about this.
I once met a women from a friend who was sexually abused by her father. I heard a number of years ago her father was finally arrested and charged for incest (thank God!) after all those years.
Dont hesitate talk to someone immediately. I think there are also child protective agencies, women shelters and other agencies that can be of help.
I want a girl who likes to talk. ......I just dont know what to say sometimes and would rather just listen.