Look, I'm 27. I've never had a G/F. I just don't see the point in even starting now, if I know the odds of it being doomed to failure are so astronomically high. Why waste all those hours, days, weeks, months, years of courtship, trying to get her to like you, if its all for nothing? I haven't spent all these years alone, just so I can find someone, only to lose her again.
I've liked people in the past, but the only love I've ever known has been unrequited. I don't want to be hurt by anyone anymore. If all I have to look forward to is a string of fruitless, ultimately futile relationships, then I quit on the whole thing. It's just not worth all the emotional pain. I don't see dating as a fun activity. I see it as highly serious.