55 years old and unhappy?

I suppose what I am most unhappy about is not finishing college when I was much younger. Not being in iduous pursuit of my goals. Now, wanting to go back to school not being able to afford it or should I say not willing to pay for it, since that would mean I’d have to continue to work on a job, doing something I detest for the next 2 years or so. Unhappy or ungrateful some say because I’m not doing what I want in life. I have a job, an apartment, and a vehicle. I’m able to go out to eat virtually every day. I’m too tired and perhaps lazy to cook something for myself, I suppose. Sounds ridiculous as I’m typing this. I believe at my age working should be just about over with. At least working on a job because I have too. There was a time; I went to work because I wanted to. I’m just not the man I was, and that’s depressing.