I hate conflict. I avoid it like the plague in real life.
But in a book, it's necessary. Without conflict, there's no motivation. No motivation, no plot. No plot, B.O.R.I.N.G book.
So you've got to give your characters conflict. Inner conflict. Conflict with parents, with boyfriends and girlfriends, with the environment. Conflict up the wazoo. Just keep throwing that conflict at them.
Take your character's worst nightmare, and throw it at them.
And see what they do with it.