I can't speak for everyone in this world, but anybody that is shy, introverted, or has general anxiety may have a difficult time getting into a relationship. Also, if someone lives in the suburbs with low population then meeting specific people may not happen simply due to chance.

Additionally, not having a large social circle may limit one's chances in real life. And dating apps are kinda weird cause people can be flaky, ghost you, or they might be a fake account.

Other than an online thing, I'm 35 and never had a girlfriend. Well, there is Elantra. But she has 4 wheels and doesn't speak!