Don't bailout. There are always lows and highs in this journey. This is a "low" phase. Try to get over of it. Even if you are thinking about a new idea, there will be a phase with that idea where you will feel "low". It's very frustrating to see afterwards that you left the journey half-way. Let your users/customers decide if this is failure or not. Then it'll be obvious if you should quit or continue. I did this mistake before. I'm going through this situation again, but this time I learned the lesson from past experience. So I'm not quitting when I'm at low phase. I'm pushing my best, and I hope a high phase is ahead. All the best!