Relax big fella, That you feel lousy means you want to do better and realise you could have done better, nothing wrong with those feelings. Perhaps the Capt could have cut you some slack as it was your first Sim since endorsement.......don't forget some people validate their own worth by degrading those around them. In time you will look back on this and realise it was just part of the patina which denotes experience! If you talk to your mates they are probably feeling the same.
Chin Up