In what ways do you limit yourself? Perhaps you and your friends don't use items in SSBM? Or maybe you don't like using those super powerful weapons in FFX!
When we were little, I would play Tekken 3 with my brother and my cousin and we had a rule where you couldn't use Eddy. We thought he was so bad ass and unbeatable because we would spam one of his combos when we did play him.
Personally I think it's silly! Unless the game is poorly adjusted then I let it define what I can and can not do.