I hit this point a few years ago at 28 or so and it changed my life. It used to be after a loss I couldn't talk to anyone the rest of the day. Now, I realize, oh well, there's nothing I could have done to changed the outcast and there's not enough life to waste a full day pouting (it has nothing to do with apathy toward the program, by the way, strictly just a different outlook on life). I'm still bummed when we lose and the highs are still just as high when we when, but I've learned to move past the losses pretty quickly now.
Testify! I was the exact same way and have evolved to the same point when it comes to "my team(s)" losing today.