When I created my first company most people thought I was crazy when I told them my idea. It turned out to be a brilliant idea that worked very well but most people did not recognize it at the time, let alone put the resources to copy it...
In fact, because I was young and naive I was enthusiastic about it, but talking to people(specially experienced people) made you doubt in yourself.
Now I have friends that are also successful entrepreneurs, and it is a very common experience among us.
Now I don't talk with lots of people about my ideas, I don't want to argue or convince or whatever.This can make you to hang on on bad ideas by ego before they are tested. I just test them in the real world as fast as I can.
Most of them are not good once you test them, but thanks to them you iterate or discover good ideas.