Hmmm.... seems like you've grown up already, so it's going to become harder and harder to get lost in videogames, because, you've seen it all..
SC2 is really the only worthwhile game out now that you can "progress in", all of the other games are primarily grinders or reflex based, which have very little progression to stay interesting to seasoned gamers.
Maybe consider getting a new computer, look for an i3 or i5, sandybridge, ivy, haswell. at least 3.3ghz.