This is literally the most motivating thing that has happened to me in almost a year. Short, sweet, and describes my exact situation. I'm glad to hear it's not just me.

I get motivated when I am able to accomplish goals.

I get demotivated when the owners sell me on a pitch that they asked my advice on creating. When I tell the truth about our product's technical status, I am being difficult and not a team player. When I sugar coat things, I am yelled at when the product isn't what they hype it to be.

That is demotivation. Instead, just let smart people build your product.