I knew at around the age of 12-13 that i was attracted to both sexes but i was in denial for some time - the fact that i mostly had relationships with men whilst also feeling sexually attracted to women both confused and frightened me. Eventually i grew to accept who i was and i suppose sexuality is more fluid then we're made to believe anyway - to my mind however if i love someone, if im happy being with them then genitalia isn't important. Best of luck coming out.