I got married to a somewhat ambitious guy, had some kids, and suddenly I didn't have that problem of not knowing what to do with myself.
It's because now I was involved at a deep level, and I had to get moving. If I didn't do it, it wouldn't get done, and my kids would suffer.
my husband also taught me that the way to raise kids is to "keep them busy". I didn't know that.
Sounds like you didn't grow up in a very active family. They probably sat around like mine did, and we had no activities. Just went to school, my dad went to work, my mom stayed home, and after school and on weekends we all hung around. That could be why you are so unmotivated--just repeating what you know.
Something is going to have to touch you on a deep level to get you out of your rut. Do you care about anything? I didn't really until I got married and had kids. And it was a gradual beginning to care, too, just like becoming unmotivated like you are was gradual. These things take time to change. And I think you have to do something soon to start to change, or it may be too late, you will be so stuck in a rut and schizoid-like that you won't be ABLE to care.
I was forced by my circumstances to get busy, and by being busy for a long time, I actually started to care, too. I had a role, I was involved.
First thing I would do for sure is learn to drive. I didn't learn to drive until I was your age, but then I did make that move. And get a pet, a dog if you can, or a cat otherwise--it's just that dogs are more needy. 2 dogs might be better, they will have each other and it's more companionship for you. As I found out, when something/someone depends on you, you have some motivation because you are important. It pulls you out of yourself and your slump. You need to feel needed. And when you walk your dogs, you will get exercise and feel more alive as a result.
Life can be a living hell if you don't participate. People are social by nature, and it is very destructive to feel nothing and stay in a slump. Get the pets--dogs are the best, maybe get the kind that cannot bark if your landlady would object--and gt the driver's license. And do things for your neighbors--reach out, because that is so essential, even if you don't feel like it. And you won't. Remember, this will take a long time to fix. I know, it happened to me.
Best wishes. Get the pets tomorrow!!!