I get sad when people I’m chatting with online don’t reply to me but I see them still posting

It’s sad that this bothers me so much especially at my age. I’ve been chronically online since my teens but I’ve never found an online friend that would consistently communicate with me. They usually stop responding to me after like 3 days and don’t tell me why but I will see them posting things on their profile. Each time I wonder if something is wrong with me especially since I have no friends and struggle to make friends in person as well. I hate Reddit but it’s one of the few popular anonymous apps where people can talk and discuss things I don’t know what other app to use. If you know a good app please let me know because I usually feel brain rotted and depressed when I’m on here. I keep hoping to find a friend online but they always let me down. People are so flakey on here. I know there’s so many others that have had the same experience as me since I see similar posts talking about this. It’s ironic that the internet is one of the most anti social spaces even those people that claim to want friends and are lonely also still flake.

EDIT: Since posting this I’ve gotten DM’s from men only. Please don’t send me a DM if you are a man or under 18.

EDIT2: I also want to add that I’m not the clingy or entitled type as some people are assuming.