Bisexuality Support Group
Bisexuality is a sexual orientation which refers to the aesthetic, romantic, and/or sexual attraction of individuals to other individuals of both their own and the opposite gender or sex. Most bisexuals are not equally attracted to men and women, and may even shift between states of finding either sex exclusively attractive over the course of time.
That's great, why do you want to make life more difficult and boys to the girls? ;)
"Dicks scare me and gross me out because of shit that happened to me years ago, and for a long time, I felt the same way about things like masturbating and sexual acts with either gender. "
I think the best thing you can do now is focussing on your negative experience, with a friend or better get professional help. After that you might see clearer.