WHY IS IT SO HARD!!!

Go fullscreen :D I feel the same way, the box is tiny and there is limited ink! Not that I've ever used all of it. And don't feel bad, traditional art is ALWAYS easier than digital. Frustration is natural, just don't throw your laptop. It gets more than just you angry. 

Moral of my rant of doom? Don't give up, and keep your head up! :D