Well, sorry to be blunt, but you're simply not going to "take the pain." You'll either learn to roll, or you'll quit parkour.
I'm not saying that as in I'm going to track you down and make you learn, but it's a simple fact that if you're actually taking parkour seriously you will eventually practice the roll to where you have learned it, or you'll simply quit parkour. Honestly, it really IS that essential, and every true traceur will and has learned the roll. It's not really an optional part of parkour, to be truly honest.