Uphill battles are often worth fighting.
A number of military historians would beg to differ.
It sounds cliche but it's literally true that there's always time to meet new people no matter what phase of life you're in.
Related: when I was 25 I had a depressive existential crisis and felt like my life was basically over. It's common, and therapy was a lifesaver. If you feel like you might be depressed then talking to someone can really help. Take care of yourself as best you can!
Everything young parents don't have time for or are too tired for.
"Nothing in this world worth having comes easy"
And we always can try finding the gentle slopes, going around on the longer track, less crowded. The journey is what counts not the destination here.
That said, I met my spouse in my early 30s. Was worth switching countries for and that was 13 years ago. We met playing the same silly text-based MMORPG some years ago. I have never been very social, but not being social doesn't mean that you won't meet people in non-traditional ways.