After some internal conflicts of my own, I came to a great realization.
"Should" and "Want" can be two different things...and boy, can they fight!!
Is your story lacking conflict? Does it feel lukewarm? Do your characters seem a little too happy to be interesting? Take a look at what your protagonist wants (goal). Now, take a look at what the protagonist SHOULD want.
Are they different?
If you can make what the protagonist SHOULD DO come into conflict with what the protagonist WANTS TO DO, then you'll have immediate tension in your story.
Have you ever experienced this in your life? Did you choose to go with principle or emotion? What about your main character?