It's never, never too late. I've seen men aged 60-75 get GFs and wives. One of them even had children with his new wife. Talk of the town is that one of these men never had a partner before.
It takes a lot of work and compromise. You are getting one glance at a lifetime.
I got married sorta recently. My biggest hold-up was the fact that the most optimal outcome of marriage was this: I was going to spend the remainder if my life making them happy, always being there, and being an essential part of their existence, and when they need me most, in their golden days, near the end, they're gonna have to hold my hand and watch me fucking die.
I told them this before I proposed, and the crazy thing was, they were still all for it.
Meh, it can be easy to feel like that.
But take a moment to look at all the songs, movies, poems, and books about people who felt this way since the begining of time and know you're not alone :) https://www.youtube.com/watch?v=ovoBi3pXD_A
Everyone complaining about the gross vibes of the post, which like yeah, true. But also even within the framing of the post itself it's just bad. The second and third lines are basically "realise X". The third line adds nothing of value to the original OP's intent.
Don't lump the guy in with incels. He's not blaming other people for his problems, or complaining. He's just lamenting. I don't see anything in his post that's gross. Leave a lonely dude alone. God forbid he let himself feel sad for 5 seconds.
It's a bitter pill to swallow, but the truth is that some people just aren't meant to be loved. I think accepting that is, for some people, a bit part of growing up and becoming a more mature person. You gotta stop being envious of others who possess something you never will and just kinda...get on with your life. Find a cause you care about. Put your energy elsewhere. Maybe stop watching romcom anime.
I don't know if that's a part of the problem or just a separate problem altogether. We expect people to partner up, when we should normalize people being alone. When people don't or can't, we might be hardwired in our monkey brains to see them as outcasts from the group.
That's pretty much where I'm at. I'm 38 and supremely pathetic in the eyes of society. I've just accepted that I'm entirely undesirable and live how I want to, or at least live in the way I'm allowed to. In a way I've turned into my parents where I find myself saying "life isn't a fairy tale" to people kinda often lol there is no "someone for everyone."
I'm not completely discounting the possibility you're right, it is possible you're just very unlucky, but your line of thinking is pretty consistent with people suffering from depression, and depression tends to make you make decisions that make you stay depressed.