In reply to mayhematic:
Its all part of the 'headgame'. Outdoors on real rock can feel a fair bit more sketchy than indoors, plus I guess its something you settle into more as you get more experience on the real stuff!
Plus, as you mentioned some stuff can get pretty highball, and its fairly natural to have the odd day of deciding to bail! I've had days when i've backed off problems i've repeated loads of times before, mainly just because my head wasn't in it that day.
As another person suggested, get down a local climbing centre and practice/learn how to fall. May sound bizarre, but it can help. Also do you have a bouldering pad & anyone Spotting for you? Having a pad in the right place can give you a big chunk of confidence, and a spotter that knows their role can be priceless.