Nervous about phoning this guy ?

so ive been talking to this guy (online) for around a month now and we get on really well :) but he lives too far away for a real relationship or whatever. anyway ive messaged him on facebook and skyped with no mic but now he wants to ring me and here my voice. this would be fine except ive sort of a low voice for a girl, and i no its not oo important but most guys no what there getting from the beginning its that he hasnt actually heard me yt im nervous it could be a big turn off to him ? any idea what to do ?