A related idea is for people who have some goal they want to achieve, like having a romantic relationship with someone of their preferred gender

I am 22 years old, and I have never had a girlfriend. At no time in my life have I remained single by choice.

I strongly suspect that this has more to do with a general inability to form social contacts, than anything specific to forming a pair-bond. Wherever the difficulty, the goal is to meet and befriend someone with whom I can share a meaningful and lasting intimate relationship, and socializing-in-general would be no more than a means to that end.

It is likely that I have heard all the general advice on this subject, multiple times, and enacted it where applicable. Nothing in the cached wisdom has proven helpful. I am still single. And not merely single but genuinely alone without friends or associates, and starting to feel frustrated in helplessness about it.

If there's help to be had, I would be glad of it.