Strangely, I am basically the opposite of this.

No formal training whatsoever, basically only sing in the car, shower, or karaoke bars.

I am nowhere near good enough to be some kind of professional vocalist, but I am usually in the top 3 singers by actual ability to hit the right notes on songs, at any given karaoke / bar outing.

I'll usually try to cajole another actually good singer into some kind of duet, be it either an actual proper duet, or basically if its like a song from a singer with incredible range in the song, i do the baritone lines, they do the tenor or falsetto, we both sing the mid range, we basically act as live backing tracks for each other.