I believe that you already have your own voice. Put it in language development terms. You learned how to talk from your parents and others but you sound like you because of your physical structure, phrasing, thought processes, musical and life experiences. This "you" comes out in your playing. I'm sure if people who have heard you play heard a tape of you playing a similar song along with 10 other players, they could pick you out. Just keep playing and listening and your voice will become more distinct.