Can I be a famous writer like Walter Mosley?
Maybe. Are you curious about becoming a famous writer because you like to write scary stories?
I don't think so. I just like reading
You need to be more realistic in what you are wishing for. Becoming a famous writer is almost impossible to obtain so be more focused on what you can realistically attain in your life.
I feel as if someone should tell me what I should do but I'm smarter than that and won't listen anyway.
You should listen to some people some time. Especially if they have a lot of knowledge in a subject and they think that you should be more realistic in your goals. Not everyone can be a writer, much less a famous one.