Not necessarily. I'm not that guy or some incel (in the "ideological" sense), but still a perpetual >tfw no gf.
When I was younger, below 18 and in my early twenties, I felt that it was lonely but there was plenty of time. That in University I was bound to get a gf for sure.
Now I have finished University this year, I'm in my late twenties and it truly feel like it's "too late". The train of young love has long since left the station. The loneliness and longing for a gf is stronger than ever, sometimes crushing.
And if/when I get a gf now I imagine it will not be the same as it would have been, we will probably both have jobs, not really any carefree days to look forward too. It also feels like a gf I find now will have to be the one. I mean it's time for children soon, so a few years at most to feel each other out. Not as if you were younger and had all the time in the world, live in the moment, not have to worry, thinking about whether this will be the one I want to spend my life with.
In short, while some of the teenage angst may be calmed with age, it will not get better on the loneliness front.
And the worst thing is knowing it's pretty much entirely your fault. I hardly did anything to get a gf, always been too much of a coward on that end. I have only asked out one girl in my life, that was now in uni, but other than that I have done nothing. My life could probably have been entirely different if only I have had some more guts, or stronger will, to just ask some of the girls I've been close to out.