Who the F...k is that inner critic?

I have performance anxiety since my late twenties. However, I have managed to push forward and have pretty good sex life. Quiet promiscuous while single yet struggling. Recently divorced after 25 years of great sex marriage and now I am having problems again.

The constant in my life is what I just learned here. Inner Critic to whom I owe all my performance anxiety. Through out my life I thought is was an evil spirt, a schizophrenic problem and to be honest I still don’t know who it is and why does it torture me with negative thoughts. If it were not for it I would be free and happy. Somebody please tell me and maybe how to kill it.