I'm not going to claim to be an entrepreneurial guru; I've started a few businesses, and most have failed. So feel free to disregard anything I say if you don't think it serves you. Nevertheless, here are a few ideas to try on and see if they fit:

I don't know if you have what it takes. But I do know you haven't really given it everything you've got, or you wouldn't be here asking that question.

Personally, I wouldn't be scared about people stealing ideas, because it takes a lot to go along with the idea to make it a reality.

Gary V is the man. Listen to his speeches and consider what he has to say.
https://www.youtube.com/user/GaryVaynerchuk