How do i know if I'm bi or a

to make long story short, i was a virgin till i was 21, i went to cali for a vac. and this guy liked me with doesn'tnt happen to me often, so i said why not get it over with well it sucked i don'tt know if it with dude or it was my first time,and when I'm watching tv and see a girl like jill bennett oe erin kelly its like ok what is that felling.. so i just wanted to get this out of my system, i dont have people to talk to .sorry i know im all over the place but im a lil nervous.