Splendid explanation big G! nice graph Tig.
I'd just like to ad what another guitarist wrote me.

Are you your own worst critic?

I know I am... I can't tell you how
many times I've stepped off a stage at
the end of the night feeling like I've
never played so badly...

... only to have someone then come
up to me and say that they've never
heard me sound better.

What!? You've got be kidding me, right?

Well, that's what I'm thinking anyway...

But here's the thing - what you are
listening for and noticing while you
are playing is completely different from
what someone else is hearing and thinking
when they hear you play.

You might be hung up on the fact that
you missed a note 12 bars back while
someone else is impressed by the sound
of the note you hit just now.

Now obviously you have to play for
yourself and your own enjoyment...

... but just for today try not to be
so hard on yourself.

Take a step back and try to enjoy the
music and not what you're having to
go through to make it come out