Is Lope-sided a problem?

Hi all, this problem has bothered me quite a long time. I have keep swimming for almost one year. I always breath to my right side. Recently I tried to breath to both sides. It is really hard to break the old habit. Finally I can breath to both sides (breath once per three strokes). But still there are problems. I can't do breathing once per two strokes to my left side (to right side it is ok). I will feel tired quickly if I do that. Also when I do the breathing to both sides (breath once per three strokes), there is an obvious diffence between the two sides. Breathing to my right side, there is a powerful thrust (at least I think so) when my right hand enters the water after finishing the breath. While breathing to my left side, there is nothing like that. So now I am confused, should I keep on working to make both sides equal, which I feel is almost impossible, or go back to the old way? If I go back to my old way, will it cause any problem? i.e. distorted spine, which is horrible. Sorry for my nasty English.