And google wasn't the first to invent search. The "First Mover" advantage is overrated in many cases.

Frankly, I'd be worried if there wasn't competition in your particular niche. Either you have stumbled on something truly revolutionary (unlikely) or the niche is just too small to support more than a one-man company. So, competition is good.

basically, being the first is not always an advantage. If a startup implements your idea before you do, then make it better, make it easier to use. And the good thing in being second is that you already know if people like the idea or not.