We tend to get in a state of mind that we cant do certain things. Sadly we even get told by others that we cant when really its a lie. Anything is possiable as long as you put effort into it. Stop believeing those who say you cant and believe you can.
I believe I can eat all my parents' food this week! 
I had to keep this in mind when certain people started to give me a hard time over my game. Not the nice helpful ones with constructive criticim but the pretentious cynical wind bags and pseudo activists. You know what is said,none of us can please everyone!
yeah i've been thinking about this phrase too. I want to believe it's possible for me to finish developing a game. I really want to do that.
I put myself down too often, I need to stop doing that and believe in myself enough to achieve my goals.