You ever read a story and felt a little disappointed? Maybe the reason you were disappointed is because th characters didn't have any real problems. I've felt this way. Even when writing. I literally sat at my computer saying "This is CRAP!" And why? Because there were no complications. Nothing holding this character back from it's goal. Internal complications only work so far. Self Doubt, Insecurities and all that jazz, it only works for about two scenes. Maybe three. Then the character will sound like a whiny douche. (Never a good thing) So complicate things. In my sequel I added a fake pregnancy and some other fun stuff! :)
Have fun making character's lives complicated.