I'm glad you're making changes in your life. That's great! I wonder if you can add something to your life instead of sitting at home and playing video games? You might meet some sober friends if you tried an AA meeting, some people to hang out with. Also, it seems like you think not going out to the school parties is punishment, and it isn't. It's also good to remember that alcohol is a depressant so if you're drinking at all, you will still feel the effects of it.
Good for you for seeing a therapist to help you get through this.