>>209
>I pushed away all of my friends when I was in highschool and isolated myself to just focus on my hobbies of anime and video games
>It's so easy to just delete and block strangers you don't even really know when you get in a fight instead of trying to work through differences
>I've totally cut myself off from everyone
I don't mean to be a jerk by pointing out the obvious, friend, but it seems you already know exactly why you don't have any friends right now.
I think what you're really asking is not "why don't I have any friends" and more "why do I want to push people away if I also don't want to be lonely?" I don't have the answer to that question, because I don't know you, but I can tell you that you're not alone. I myself have a habit of abandoning friends when it is not longer convenient for me to keep in touch with them; which is a bad habit to have when you have social anxiety and it's rare to make friends to begin with.
>How can I make that kind of relationship with someone as an adult?
The same way you'd do it as a kid. You have to be around other people and share some significant experience with them. Whether it's work, or school, or a club or hobby. You do the things you need to do in society, meet people there, and talk to them. If you spend most of your time on the internet, most of your pool of possible friendships will also be over the internet.
>Online "friendships" just feel like a waste of time to me, and they're so fragile
I know what you mean, as I have made and lost a lot of friends over the internet, but while it is easier to terminate online friendships, they are not fundamentally different from real life ones. By that I mean, you get what you put in. It may be easier to end them and never speak to that person again due to the distance and facelessness involved, but it is still your choice. Online friendships don't just end despite your wishes; you have to decide to end them.
I apologize if all this seems like stuff you already know, but I'm afraid that's only because there is no secret to getting out of your situation. I don't know how much that helps you, but I do know that it wouldn't help you to imply that there's something you've been missing when there isn't.
If you'd like to try being friends with me, email me and we can talk. I can assure you I am very easy to get along with. If it doesn't work out, though, hey - at least you tried.