yorolpal
I'm not sure that not knowing how to actually play your instrument disqualifies you to perform in public;-)
I'm living proof of that.
I've been "playing" guitar and keys (not piano) for thirty four years and even after that amount of time my skills are, to say the least, somewhat limited. Regardless, I have performed, within a four piece rock band, in public, although I would have to admit that no money came from it. Damned fun though and I "sometimes" miss not being in a band.
Reason I say this is, self taught is great, but it does not suit everyone, and some of us need that push. In my case, it might be laziness, I dunno, but my skills certainly have suffered from not putting the right amount of effort in at the right time.