Alright. you have your work cut out for yourself. Go lose that weight, read up on some good stuff, and learn that guitar so that you can find some jammin' buddies and start a band and go play some dive bars and get macked on by ladies....
Oh and buy a sweet new leather jacket and take that bike out more!
You have listed so many things that you like that you shouldn't have time to spare for her.
Also, it got hella easier once my W moved out - for GAL, detachment, and working on myself. Look forward to it because there is no shortcut here to achieving happiness - you need your own time.