"And should i go windsurfing with a PFD to try waterstarting?",
Dante, my advice is: always wear a PFD while windsurfing (unless you are jumping...and I would still wear one even then). I've windsurfed twice as many summers as you've been alive and I've never actually needed a PFD, but I always wear one, just in case. If we live long enough each of us will make plenty of stupid mistakes. I try to take advantage of the simple safety measures that will lessen the harm to me from my inevitable stupid mistakes. I hope you will too.