As Don (and Ron, and TB) said, I don't understand the problem...

Needing to hear yourself seems strange - I can understand, to an extent, the need to hear others when performing in a band... but yourself?

As Mr Happy suggested, maybe a hearing test would be appropriate. If you cannot hear your own voice when there is no PA fuzzing the issue... maybe there's another problem?

I've been singing for over fifty years, often in large concert halls with no PA. Sometimes solo, sometimes in choirs or operetta groups. I have even been a member of the Hallé Choir... I've also sung solo in church whilst accompanying myself on a large pipe organ...

Maybe that's why I don't understand the problem - I've learned to cope without the need for a crutch to lean on.