You shouldn't ask anyone if your business is a good idea. It's a bad question and everyone will lie to you at least a little.

Talking to customers is one of the foundational part of building something useful.

Two books every aspiring startup founder should read.

> https://www.amazon.com/Mom-Test-customers-business-everyone-...

> https://www.amazon.com/Talking-Humans-Success-understanding-...