Please help me!Am I really bisexual?

First of all,I've had many boyfriends and have had sex before.I go to college and live in a dorm with one of my closest friends,she's a girl.I never really found women attractive,but one day my friend and I got back from a huge party.I got beer spilled all over me so I decided to take a shower.My friend barely drank any beer,but when I got out,she was lying naked on my bed.She had a flirty look on her face and beckoned me to come closer.I asked her,"Are you drunk?!" and she said no.She smiled at me and stripped my robe off.She pulled me to the bed and we laid on top of each other for a moment.She soon began sucking on my **** and fingering me.For some reason I was really turned on.She then told me,"I really wanted to do this to you,you are so fu**ing beautiful.Suck my **** now!"I did.It was a great feeling,I was so turned on,We then looked at porn and kept doing the same things over and over,she then licked my vagina a lot.Almost every other day,we'd do the same things.We also make out and french kiss a lot.