I feel like lonely is a bigger societal problem too. There a so many substanceless groups that we feel are going to fulfill us, and then they don't. And then there's substanceless people that make bigger holes than they fill because they don't know how to connect either.
I guess what I'm trying to say is don't beat up on yourself too much because even for those of us who have significant others lonely is still a thing. When I make certain friends I don't like 'em, and when I don't have 'em I feel bad too. Same with my husband- so we sit around bored and socially lonely together which is an oxymoron in itself (we both trying to work out if we're bipolar or not).
Sorry, I feel like I went off topic and rambled. The point I was trying to make was that right now it feels like society is set up to isolate everyone. Divide & conquer.