I feel like I'm running in circles and I not making progress. How do I Stop?

I've been working on this project for a while now and I want to launch an mvp. However, with all the work that I've done and feel like I'm not making any progress. I want to make the best product that could sell, but I'm not sure how to do that. Talking with potential customers seems encouraging, but I like to self-esteem to move forward with an MVP design that I feel is not stupid or embarrassing. I know that most of my problems are probably mental. So I just wanted to ask has anybody ever dealt with this? how did you get past it? what advice do you have?