The best thing that I've noticed in your post is that he's your 'ABF', and not 'AH'. I have an 'AW', and after 16 years of dealing with her addiction, I filed for divorce this past June.
As you are not married, I will tell you to do ANYTHING and EVERYTHING to put as much distance between you and the addict starting now.
As someone else mentioned, you have to plan an exit strategy.
If physically leaving is not realistic, then get as much of your stuff(valuables, cash, etc) out and secured, and see if your mother's ok with holding onto it. If you share any bank accounts, clean them out and open up your own. Cancel any shared credit cards.
Living with the guy for a duration can be a pain, so make yourself scarce. Work any and all available overtime and stock up your cash. Eat with others who can 'lift you up', by suggesting you going over to their place for dinner, maybe bring some ingredients and offer to help cook. Put on some music and make it a fun experience. It's cheaper than eating out but also lets you start socializing and building meaningful relationships. BTW: The musical band thing: AWESOME! The surfing idea is exciting! And know this: your current ABF wants the booze more than time with you, so he may not realize or even mind all that much you're not around anyway...
Just remember that his life and his addiction IS NOT YOURS. Keep 'Living while you're alive'. The light is at the end of the tunnel so keeping doing something, ANYTHING, that keeps you moving ahead to an incredible and wonderful future.