Since the first day he saw me he was all over me. I don't like him!! HELP?

ok. my first day at my new school was monday. i was nervous, but everything had been going smoothly until 2nd period. apparently some kid (we will call him bob) has been talking about me ever since he first saw me. then at break one of bobs friends comes up and yells "BOB LIKES YOU" and now bob didnt only tell his friends, bob told the WORLD. and it was a bit big cuz im the "new girl" and some guy already likes me. all of a sudden my name wasnt my name, people started calling me the "girl bob likes" and left and right were "bob likes you" and everyone says bob is ugly and they felt sorry for me. during lunch on of bobs friends comes up to me and says "bob wants to go out with you." and i said no. (btw thanks to bob abd his creepy friends my first day was quite an awkwars one) then all in a group, bob and his friends started following me around campus (still at lunch) yelling "hey baby wanna go out with me?!" i kept screaming no and trying to walk away and finally the bell rang and i quickly went to my cl. i was very disturbed. toward the end of the day there were more "bob likes you" people and at the end of the day i was tired (this new school goes longer than my old one) and as i was walking out of school this guy comes up to me and says "bob cried he likes you so much and you dont like him." ok seriously, thats hard to believe. but i had had a rough day so i yelled "WELL TELL HIM THATS FREAKING TOO BAD" and stomped off. hes ALL OVER ME!!!!!!! what do I do?!!!!!!!!