Someone once asked...
Someone answered with kindness...
Honestly, "hard to get a girlfriend" is doing a lot of work in that sentence, and I don't know your specific situation, so take this with a grain of salt. But if I had to guess at the most common invisible reason: a lot of guys treat dating like a problem to solve rather than a person to actually get curious about. You end up performing "boyfriend material" instead of just being interested in whoever's in front of you. And people can feel that difference even if they can't name it. The less romantic but more useful question might not be "why can't I get a girlfriend" but "am I actually building a life I like, with people in it, regardless of dating?" Weirdly, that tends to fix the first problem as a side effect — confidence that isn't about being chosen reads very differently than confidence that's performing to be chosen. Also, sometimes it really is just numbers and timing and nothing wrong with you at all. Don't let one dry season turn into a story about your worth.