Tests done since 1933 show that people who talk about their intentions are less likely to make them happen. Announcing your plans to others satisfies your self-identity just enough that you’re less motivated to do the hard work needed.
I understand the urge: that new and sexy idea-turning-reality is just too exciting not to share; I frequently blab about our projects with friends. But there’s a far more serious and damaging level to which many take it. I know people that describe in glorious detail their app / site / company, only for it never to see the light of day. They register the domain alright, but beyond that, the rest is but a dream.
To sleep, perchance to dream.
Hamlet worries about what dreams may come after his suicide, but oftentimes shared dreams are suicide themselves. So I suggest you try the opposite: shut up and get busy. There’s nothing sweeter than sharing a secret worth sharing. I’ve experienced this with quite a few of the apps I’ve worked on and it’s a pleasure. But wait until you see the next app!