How do I find out what I want?

I read used text books for fun. I like ordering books from Amazon. I don’t know what to do with my life. I thought I could go back to university but I can only come up with getting a pH. D. In Arts or general studies. I am certain that when I come up with a plan that God will provide motivation. For the longest time I thought that I would become a psychiatrist or psychologist. I don’t know if it is what I want anymore. Trying for an eternity; banging my head against the roadblocks forever seems dumb now. I asked for help and the advice I get is to focus on the now and get in shape and to take care of myself. Fluthers advice is to go outside and walk and I do the best that I can. I don’t like walking outside.