Some assume we like being alone. Some assume that we were meant to be alone. And some assume that we are gay or lesbian. For any given person, one of these assumptions could be correct - but people who make such assumptions will often be wrong. Some single celibates particularly resent the assumption that they are gay.
Involuntary celibates can be straight, bisexual or gay, and only they can know for sure.
Personally, I believe that there is nothing wrong with being gay - I'm lesbian myself, and quite comfortable with it. I have written an article about involuntary celibacy for the gay community , to make this point. The only way to know for sure whether you are gay, straight or bisexual, is to think about who you are sexually and romantically attracted to. I came out of the closet around age 20. I had some difficulty believing that I was really lesbian.