I have basically an XXXL Size glove hand So hard to believe your hand could be as big or bigger than mine and I could rip through Eddie Van Halen licks as fast as he does although I have been playing for over 40 years but my fingers have no problem fretting strings without touching other strings, remember you need to only touch the string with the very tip of your finger close to the fingernail not by the pad of the finger but only by the very tip that could be your problem?