[itamarst]

Evidence.

Instead of coming up with idea and guessing what would be useful, I did research on problems people had, and then got additional evidence that a particular problem I'd discovered resonated. (See e.g. https://stackingthebricks.com/how-do-you-create-a-product-pe... for intro this approach.)

That meant every time I had those negative thoughts, I could come back with "but you have so much evidence!".

(In my case evidence was: bunch of online discussions of people talking about problems, wrote some blog posts about those problems, one blog post got tens of thousands of hits, and other blog posts on topic got lots of hits too. So clearly a problem people have. And product is something these particular people will pay for.)

[tudelo]

Where would you suggest people go to search for problems?

[itamarst]

I suggest going through stackingthebricks.com and just reading lots of the content there (not my site, just a place I've learned a lot from).