Leaving one life behind is one thing and starting a new one is another...you can get stuck between the two sometimes.
Do you have any sober friends or friends who wouldn't mind hanging out without alcohol being involved? could be a good place to start.
Think about hobbies and interest and what you want to do with your life Charlie.
If you really can;t muster up any enthusiasm, then maybe some of the others are right here and you're depressed?
D