Your first story probably won't sell. Or your first novel. But keep at it. Nobody cares about your idea. Ideas are free.
Most pros are actually pretty nice.
Most of them adhere to a 'pay it forward' philosophy. Folks helped them when they were unpublished, and it's likely they'll help you. And pros are people, too, who occasionally are in bad moods, or even ill. I still hear stories about a certain author who was accused of 'hiding from her fans' at a convention some years ago. The woman was sick and actually spending much of the convention being miserable in her room.