Biggest fear

A little of both in my case, I'm an engineer who's just been coding my side projects solo for a while and am not used to pitching things in general (but do want to eventually publish something people will use)... What I think: Is my product good enough? Will my pitch be convincing? Am I in over my head with what I'm trying to build? What they might think: Will they take it seriously? Will they think it's a bad idea? Will it look like a superficial money grab?