Shit fdd,i have so many stupid hobbies i cant get the time to do them all,find something your interested in from your childhood,like model cars or collecting rare hotwheels cars,erector sets,gi-joe's,autographs ect,any hobby that involves collecting rarities can usually fill the void with time spent crusing ebay trying to make deals on a new accusition.
When i run out of interesting things to do, or im tired of my hobbies i hit the pawn shops & used record stores to work on getting must have albums for my music collection.
Its obvious you like music if you play guitar,why not cruise ebay & put yourself together a stereo system out of vintage pioneer or marantz gear that we all had when we were kids,it's became a highly collectable & desireable hobby to be in,not to mention that the stereo gear back then was way better than what we can buy at stores today,better quality,better sounding & better looking too.