There was a point made by Kendall that you should listen to. "you get to do it your way and don't worry about how someone else did it".
Kendall in my opinion hit the nail on the head.
Here is a mistake that is done by many musicians. They try to sound (in some cases look like.)like the original singer. Until you can get that idea out of your head you will always be questioning if it sounds good or not. Just be yourself and sing the damn thing. Some songs are sung better than the originator in many cases.
Beer (adrien)