james,
You actually are half way there, my friend.
You know your gaming is out of control. You know you want to stop. AND you know that you are using it to avoid other things in your life.
Now you just need to go for it and stop!
I used to do drugs, smoke cigarettes, and all other kinds of addictive behavior. I got past it. The real trick is having the courage to face whatever you are avoiding and making a decision within yourself to let yourself feel all that pain you are trying to distract yourself from. Once you do that, you will be able to make things better for yourself (going out and meeting people, etc.). When you first stop gaming, you will probably feel like a mess for a while. Consider that a good sign. You will have taken away one of your usual defences against facing things. You will be in a situation to see what is truly going on inside you.
When you do make that commitment to Stop you must do it completely!
The desire to go back to it will be there, but you can just notice it "oh, I want to play a game now" and then ignore it, and move onto other thoughts.
You CAN do it James! Best of luck to you