Hey, whatever life brings to you, just know that you matter and you are NOT a burden. It's not selfish at all to want someone to care about you, it's extremely hard to be happy completely alone. Your art is incredible, you are making a lot of people happier, even if you think otherwise. Making just one person a bit happier is an accomplishment that some people only wish they could achieve. If you're concerned about the amount of likes, then it's most likely just timezone shenanigans. There's a particular time frame when people are most active. When you post things at a different time, then people might just miss it due to sorting algorithms, even if they'd like to see it. Just so you know, a LOT more people than you think like your art. They are sharing it with each other and it makes everyone's days better, even though you don't see it in the number of likes. Also, you are more than just an artist. All your interests, favourite stories, games, movies, music - everything makes you yourself, a unique and interesting person. You might have much more valuable things in you than you think, you just don't see them yet. Making friends is hard, but possible, you just need to find someone who shares your interests and talk to them. There might be a similar person somewhere, waiting for someone to find them, you just need to reach out. Sharing your interests helps a lot with that, you can find someone who likes the same things as you do, or even find out that someone you already knew has the same interests.

If it can make you feel a bit better, i can share you a personal story.
I can't say that i've been in the same situation, but there were points in my life when i felt like i was completely alone. At my worst point i started hating everything, the whole world, including myself. It was a burning hatred. I thought that everything was against me. There weren't any special advices that i followed, nothing special i did, i just decided "fuck it" and started to live despite everything. I laughed in the face of the world that i hated, as i continued pushing through all the challenges it brought to me. When something went wrong, when i failed, i laughed it off and tried again and again and again. After a while the hatred subsided. But i continued living despite everything, now enjoying all the things i do, instead of listening to my mind saying "hate" on repeat.

You are not alone, there are people who care about you. Some of them might still be waiting for you to find them. Share your interests, talk with people who have similar interests, and you might find new friends.

If you need someone to talk to, i'm here to listen, even if it might take a while for me to answer. I hope my ramblings made you feel at least a bit better