I love to sing and I do think that my strength as a singer is... I think I have a voice that is certainly sufficient under most any circumstances... but I think my strength is that I really am an actor and I really do have to own what I am saying.
As long as you know, within yourself, that you're no better than anyone else out there, you're OK.
I am very self-critical, but that's a good thing because it keeps me growing as a human being and as a musician.