Byline: Mark Brown Orange County RegisterSometimes you just can't win.Goo Goo Dolls singer Johnny Rzeznik was thinking about getting out of the whole music rat race altogether.``I was just thinking, `If I can't make a living playing music, I'd better do something with my life,''' Rzeznik said from his home in Buffalo, N.Y. He wasn't about to go back to college to become a social worker, as he'd been planning. On the other hand, ``I don't want to be playing in bars for 30 people when I'm 40.''And for much of Rzeznik's life, that's just what he's done. Play in bars and clubs and release critical