I feel like I'm a bad singer, but I sing anyways (when I'm not too self conscious to do so). This is the voice that God gave me, so whatever anybody thinks of it, I'm going to use that voice to participate in worship.
Similarly, for someone who's a talented singer but chooses to sing differently than others- go for it. Don't feel that you have to be "acceptable" to everyone else, or that your style has to "fit in" with others. If you're receiving comments on it (good or bad), then I'm tempted to say that your fellow congregants are focusing too much on the flesh than the spirit, and that's their problem, not yours.