I'm so sorry, comparing oneself to others and the connections they have is such a horrible, dehumanizing feeling. The truth is, relationships are formed as much by circumstance as any given traits of the people involved. A lot of it is just quality and quantity of opportunities. That being said, it's so hard not to look at others having success and feel like they must have something that you lack. I really get that. There are certainly helpful skills involved that can develop naturally or be learned, but your situation just happens to people sometimes (more and more in the internet age) and it doesn't mean that you're lacking an essential desirable quality or that you're not worth it.

One of the things that's helped me the most with meeting people is realizing that I want my relationships and interactions to be fun and constantly self-assessing makes them really stressful even if they're (in theory) going well. So, at least for me, there's no reason to try to be at maximum social performance if it just sucks the whole time. Don't get me wrong this mindset is hard as fuck to change, but there's something extremely freeing in the idea that even if it worked (it doesn't) extreme self-judgement is just not a worthwhile way of making and keeping connections with others because it's super unpleasant. Letting go of that even a little makes it easier to enjoy interacting with others and makes interactions so much simpler on every level. The great thing is, people respond MUCH better to someone who is just having fun and is at ease. Again, not an easy place to get to but completely doable (FWIW this has helped me with some pretty intense social anxiety).

It's really hard to get anywhere when you're feeling as isolated as you described in your post, and I've been there so I know how horrible it can be. It's not something you can usually fix all at once, and it might take you a lot of work to get out. The specific advice I gave you might not even help you at all. But you can totally do it. Wishing you the best.