Andy, I came out to my parents at the age of 18 when I was (1) still living under their roof and (2) expecting them to pay for the portion of college expenses that my scholarship didn't cover.
Their responses were fairly typical of their personalities, backgrounds, and generation. My mother--a rather religious, closed-minded, rigid nurse with somewhat backward social views (e.g., if someone got sick from AIDS in the early years of the epidemic, they deserved it for being abnormal)--asked me when I wanted to have an AIDS test. (This was in 1987 when everyone was terrified.) My father--a more gentle, tolerant, sophisticated man who I'm convinced is gay or at least bisexual--told me he was sorry for me because other people would treat me very badly.
After years of a lot of knock-down, drag-out arguments (in which, for instance, my mother would accuse me of being a pedophile and I would counter that she was probably the reason for my sexuality, whether it was nature or nurture), we've finally come to a place where my boyfriend is welcome in their home and they ask after his health and hope he's happy. That's only happened in the past couple of years (I just turned 40 this past spring).
I'm not saying that it'll take 22 years for your parents to come to their senses and accept you for who you are. My parents and I had other issues that really overshadowed the gay issue. (I'm also not promising that they'll ever "come to their senses" and realize that they love you and that their love for you trumps their negative feelings about homosexuality--for some, that realization just doesn't happen.)
I'm merely saying that if it happens, it might take a while for your parents to process the idea through multiple stages of acceptance--including grief (mourning the difference or the potential lack of grandchildren), guilt (feeling as though they were somehow responsible for your sexuality), revulsion (feeling sickened by the idea of gay sex), ignorance (not knowing what to say to you because they don't know anyone gay, forgetting that they raised you), and moral horror (believing you'll go to hell because that's what the pastor says and their own belief system supports).
Just focus on making sure you're safe and sane and emotionally stable. If they can't come along peacefully, you might need to distance yourself until they can. Find worthwhile friends who don't feel put off by your sexuality, seek out ways to grow and change toward positive goals, and learn how to build your family for your own reasons (not just because you grew up in that household).
Feel free to PM me if you'd like.
NCbear (who came out again in a BIG way in college [via an opinion piece on gay rights in the campus paper] and was ostracized by most of the 3000-student campus for about a year, but who later became old gossip--and whose 43-year-old boyfriend STILL hasn't come out to his only living parent, his 78-year-old father)
P.S. They DID end up paying for the portion of my college expenses that my scholarship didn't cover. But if I'd had to, I'd have moved out, financially emancipated myself from my parents, and taken out loans. It's a less difficult process now than it was then, but it was just barely doable.
P.P.S. On preview, what ThickPup said above. All of what you've described are normal reactions for certain types of families/parents. Just be patient and wait it out. And keep your chin up.