dont stop. dont make excuses. don't doubt yourself. They are all a waste of time. Focus on the end goal and methodology for getting there. If you really want this, move in with housemates or figure out what you need to to save a little so that you can self fund for a while. Also figure out some reasonable numbers as to why you can make money doing your startup and how long you think it will take to pull it off. Double those numbers. Otherwise, you will need to be cannonball in the chest convincing to any investor worth pulling in to fund your idea. Find ways to check your gut instinct with numbers. Understand the inputs to the numbers and understand the trends in the numbers. Own the pain, own the glory.