"Training to become a Jedi is not an easy challenge. And even if you succeed, it's a hard life. Take that line by Qui-Gon, add the fact that Anakin was raised by his mother exclusively for nine years but can't see her because of the Jedi way, on top of the fact that he's been labeled the Chosen One and he knows it(literally) and feels it and end it with his superiors constantly keeping a watchful eye on him and holding him back.
I think you can possibly see why Anakin is a little different, 10 years later...and why he goes back and forth between doing his duty and training as a Jedi and he desires toward Padme in Episode II. He's a good kid in Episode II. He's just dealing with some angst when it comes to the Jedi Way.
"Must be difficult having sworn your life to the Jedi. Not be able to visit the places you like or do the things you like."
"Or be with the people that I love."