If by "professional" you mean "play for money", then, yes, I suppose. Probably not as a sole means of income, but you could find a few restaurant/bars that might pay you a couple of bucks a week to play.

Just off of the top of my head I can think of five guys who play and sing at least as well as you, but have no delusions of being "professionsl".

The trouble with being a "Mr. Tanner" is that for every one person honest enough to save you the potential embarrasment, you can find 10 people who will tell you what you want to hear.