i am left handed and my left testicle is bigger then my right

Hi:
That's a weird coincidence. I don't think that the two things are related. Has your left testicle always been larger? If not, you should have it checked by a Urologist. If that's the case, it's not normal for you and that's why you should consult a specialist. You should never ignore something that is a change for you. Please let us know what you find out and how you are doing. We look forward to hearing from you.