I don't mean any offense to you LilFizz or anyone else that shares that same opinion, but I think it's BS. It isn't always 'how bad you want something,' sometimes it just doesn't matter.
I went to OCS with the attitude that nothing was going to make me go home. A few weeks in I started getting bad pains in my legs, but I kept going. Finally, during week 6, the top of my femur gave in to the stress fractures that I'd been running on, and broke into more than 3 pieces. I haven't walked since. 105 days and counting.
I know you mean well by saying that "if you want it bad enough nothing is going to stop you," but that is foolish advice for someone crazy enough (like me) to believe it. I'd do anything to go back and go on light duty, possibly heal up, but I can't change that now, and I'd hate to see anyone else end up in the situation I'm in.
Semper Fi.