I see. Guitar is something that requires patience, for sure. Someone can play well enough to entertain drunk friends with one year of half-assed practice. To play on a stage, it's way more time of serious practice. It'll hurt, sometimes it'll take days to see improvements. Rehearse and constant practice are the key factors to thrive. If you're lacking patience, get a tutor. He will help you build momentum. The same 'process' is valid for other moments you may be lacking patience. Get a friend you trust or a psychologist (they help well-adjusted people too), tell them about your projects, and every time you're losing patience, call them and tell them, and listen to them. They should reassure your progress, and help you get back on track.