Quitting?

On Friday, around 1:30 something am, I finally submitted a letter of resignation. I kind of have some work lined up, but not exactly sure what I'm going to do. I couldn't hang anymore. Maybe I've taken everything too personally? I didn't know how to deal with people who tell you, or your boss, over and over that you're not "producing" yet, they have no concrete explanations of what they actually want you to produce. Am I just a quitter? Am I running away because it's too hard and I can't deal with that? My boss said, "You know Raquel, sometimes in life we have to do things we don't want to do." And I know it's true, but i don't want it to be true. I want to do things in life because I want to do them. I don't want to sit back anymore and just let things happen. This is an exercise in faith. I can feel that everything is going to be fine. Just need to keep believing it.