I think you're in a depression. I say this because you say, "I don't enjoy life anymore." That's a pretty good clue.
Do you have any friends who know you well, you can talk to? Maybe they noticed when things started changing for you.
For me, the depression comes when I don't want to face something. To deal with somethings, I think of what it will be like if I don't face them. I realize it will be much worse if I don't deal with it and it will last a lot longer.
What did you enjoy before the depression set in? Oh, and how long has this been going on?