I have kind of the reverse reason for not telling people: they just kind of shrug and ask "how is that different from ________?" I explain how it's fundamentall

I have kind of the reverse reason for not telling people: they just kind of shrug and ask "how is that different from ________?" I explain how it's fundamentally nothing alike and how my approach solves some really hard problem, but it's too late: the second-guessing myself has started. Much better to build an MVP before ever mentioning it. Maybe they'll still shrug, but happens a lot less often. I've also tried to stop buying domain names and instead just putting them all on a personal website. But when I find that awesome name that is still available, I'm powerless to resist buying (I tell myself it's an "investment".)