Yeah I have the same problem. I have a rather deep voice, low baritone, and most keys don't work for me. I find that I have to transpose 90% of songs to Key of G to get them to fit my range. It is a matter of finding the chord, and note, fit for your voice. I usually have to transpose melody lines 3 steps lower to fit my voice range. Keep working on it. It will come to you in time. Lozark