What wrong being bisexual?

I feel attracted to many types of women but i few few attracted towards few guys but i don`t consider myself to be bisexual even i feel little sexual attraction towards few guys though.I feel like bad person who having theses feeling but i been having these since i was kid.I told this girl on facebook that I am bi and she was shock.I kinda almost had tears coming down my eyes when she was surprised hearing that I was bi.I am 20 year old and I to honest i`m still not sure if I am truly bisexual or not even though i felt this tingle feeling when guy on fb sent in request and ask me to text him sometimes.I kinda help but check out all his pictures on fb to see how good looking he was and i was happy each time he talk to me on fb.However I still like girl also but I have this amazing feeling each time he talk to me on fb.But I still feel bad though for being who i am because i get feeling that girl that i like on fb might deleted me and i don`t her to do that because we been good for while and I would hate to lose that.Whats wrong with being bisexual?P.S. Sorry for the bad grammar i always suck at grammar since i can remember.