Dude, you are bisexual. You've had sex with girls - that shows that you are capable of enjoying that. You just happen to have had a better time with a guy or two - that doesn't mean you must now pursue guys only. If it distresses you, then don't do it. Nobody gets FORCED to express any aspect of their sexuality.
If you say you can't handle it, we can understand that. But that's not the tragedy you seem to think it must be. People forego things they would enjoy ALL THE TIME. Some want donuts, but never eat them. Some want to rob banks, but rarely indulge that desire. It's just self-control. You just don't do everything you want, or expect to get everything you like, all the time. Life goes on.
There's really no such thing as an "LGBTQ community" to pressure you with expectations. You are simply imagining that there is a large group which doesn't "understand", and condemns you. You might feel better about your situation if you discussed it with a qualified counselor - he or she could help you relax a bit and recognize that this discovery of yours is really not the disaster it seems.
BTW: Your figures for progression of an untreated HIV infection assume a typical or slower-than-typical patient. Many HIV patients have died in three years or less after infection.