I Have a bully problem HELP ME please? I dont know what to do..?

Im a girl (13 yrs old) Im a quiet, nice person maybe thats why people take advantage of me? For example, these b**tches at my school always go by me but i try to stay away there always pretending to be nice to me but i kno dey hate me like 2day i was going to cl and dis gurl pushed me i want to fight her but i dnt want to get suspended or in trouble i want to do something because it makes it look like im a frckin loser, weakling pushover. i want her to just stop it. if i tell smeone dey will tink im a baby i have no problem wit that but theyll say i cant stick up for myself which is true smetimes i guess.