My voice puts me off rapping?

ok i rap just for a hobby. like i would recored my self rapping with an instrumental background. yes i know its sad. but anyways i have a very droll voice. and when i listen to it iam out of tune and i sound terrible. i never thought u would need singing ability to rap. when i listen to what i have done i get embaressed and no longor want to rap. and i dont want to put on an accent becuse i dont want to be like a person who thinks he is a hard man. and i try to be as clear as i can be. but when i playback the tape iam well mumbling. so what do i do. and if i sounded like any rapper it would be humpty dumpty from digital underground thats how bad my voice is. and i reached purbety a long time ago. iam not a 13 year old tenneger. so what do i do.