Col singing in the mirror wont help much....you need to sing in front of people, your wife, friends, any live audience you can look into their eyes and relate the message your sending thru the lyrics of the song. And be ready to do this at anytime, putting aside all butterflies, nervousness, anxiety & all else almost like an Actor of sorts,....because YOU have to have the CONFIDENCE that You are the BEST singer in the world!!, & YOU have to BELIEVE IT or else it will be shown in your performance on stage for examle when the director shouts "ACTION" you have to change persona and sing your butt off. The more you do it the more better you will become....good luck buddy!