This is why I think the Internet might actually be stifling innovation and creativity.
I find that more and more often I think of something, then search on the internet, and if I see that someone somewhere has done anything similar, I abandon the project immediately. After all, it's been done, so what's the point?
Net result if we push this to an extreme: instead of pursuing interesting ideas people end up wasting time in useless discussions on Hacker News, thus adding exactly zero value and failing to move humanity forward.
At a first approximation, everything has been tried by someone. It is very, very rare to have a truly groundbreaking idea. But that's not a problem! Humanity advances mostly through incremental improvements, not just by giant leaps.
So stop criticizing and start doing.