Need help with sexuality?

I'm extremely confused. my whole life i have identified as straight and looove men. now im in college and im kind of curious..haha...and im confused as to wehther im gay or not or bisexual. but every time i try to fantasize other women in my head i get extremely grossed out. so im REALLY confused??? but i still keep trying and im like afraid of lesbian women. yet i have a ton of gay friends (male gay and some female gay) and would like to think im a generally open person. am i afraid because i am one? i WANT to be straight. but i might be bisexual? however, i haven't really kissed a guy yet either (one that i've liked anyway haha so they dont count) or a girl so idk...should i just experiment with both and then wait and see? women are made so much prettier but some men just make my knees weak! UGHH :( im already an outcast in society because i stand up for the underdog so often so this wont help my case any further! (not because it's a bad thing but because i'd be a minority in yet another way!). btw im 19 and in college just about to finish freshman year. im SO confused and its killing me