Why are Bisexuals so afraid of rejection?

In my opinion, gays and lesbians have more reasons to fear rejection than Bisexual people do. When somebody is Bisexual, they may be a little bit 'different' but not like gays or lesbians are. Bisexual people can HAVE sex with men, they can LIVE the so-called 'normal' life most people say you should have.. so I don't see why they get so upset, afraid, uncomfortable or ashamed of their sexuality--it's still on the side of being 'normal.' Being gay or lesbian, on the other hand, is a HUGE disappointment in some families. To be told 'no mother wants their child to be gay' haunts you for the rest of your life (it has for me--I can't even speak to my mother or father about relationship issues). If you're lesbian or gay, things become harder for you (you deal with ridicule, humiliation, etc); but when you're bisexual.. you're a 'normal' person, you can still do the expected things.