i'm 42 and apart from my abusers which stopped at 19 i have not had sex with anyone, even my late partner of 10 years. he respected my feelings and was happy with me as i was that sex did not matter to him either. like you i still get aroused and orgasm but alone, the thought of a mans bare bits going anywhere near me freeks me out. i have to really get to know a man before i even allow a peck om the cheek. i am not interested in girls that way either, just happy with life without sex, so many friends have seperated because of ill matched sex drives or affairs that i am glad to be out of all that.
sex is a personal choice , just like nudism or religion, it is your right to chose and feel however you wish about it, don't let the majority sway your views it is your body after all not theirs.