"There is no advice for this problem."
Kersje,
I know everyone means well when they give you tips. I would say work on your preshot routine until the shots are automatic. But just because The Woim finds success with that technique doesn't mean you will.
You're a choke artist. That's what you are. No advice can solve the problem because the born loser is always looking for an out.
Maybe you could get really drunk. I've been drunk in $1000 a rack 9 ball matches before but we're talking you and not me.
You remember Bert Gordon from "The Hustler" right?
Kirsje, no offense intended on any of my advice but it could be that you suck as a pool player. Perhaps you just think you're making those shots. Maybe your opponent is leaving you really easy but you just don't have the shotmaking skills.
Being nervous is just a cover up for sucking at the game of pool.
Don't look too hard for an excuse for losing, they seem to be coming to you naturally.
If you're playing The Woim in a $1000 a rack 9 ball match, be nervous, very nervous - unless of course it's someone else's money...