Do you think it's reasonable that I'm terrified of not being able to decide on a career?
I'm not sure. Have you tried out different jobs?
No. Learning a career by trial and error seems like a very bad thing to do.
Listen, you may not believe me, but your profession isn't why you exist. Being uncertain is okay, you just need to take things as they come.
But if I don't make up my mind soon I might never get a job that I like.
It may not seem like it, but you don't need to choose your career right now. It takes some people years before they find a career that they really love. Other people never find a job that they truly like, but are still able to lead happy and successful lives, so I think you should not worry about it so much.