Question Around Confidence

Watching the possibility formula and I have a question.

I am someone who is kind of shy and like to do things without being exposed to the world. Succeed but without saying it until people notice it.

So, when I start a new project, I usually hide it from family for example until it succeed. I feel like not confident enough to say it because I am still working through my thoughts and believing in it and don’t want to support the doubts of my parents for example until I make sure it works.

I understand that saying it out loud to the world with conviction will help me create more confidence. But how to not be arrogant I am going to make 100 millions dollars! I am modest and don’t like to show up like I am the best person in the world!

So, how to speak up and show confidence without sounding arrogant?
Hope it is clear,