It's so funny, I don't even know you and I want to agree that you're being irrational. But then again, I'm 100% positive that the same can be said about me.

Have you worked on black and white thinking? The thing is this - yes, in some parts of your life you will be inadequate. I can't play the tuba. Fact. So I am inadequate there. But in other areas, I am. Is it possible that you are blanketing everything? That if you aren't 100% adequate in all areas, then you are inadequate?

This will make your brain hurt, and this is what therapy is for. I personally would follow it for a little while and then double back to where I started.

But...
Is it okay to be inadequate in some areas but just avoid those areas? Stick with what you know and what you're good at, and let the rest go?