don't feel bad about anything. they're probably so burnt out that didn't want it anyway, not saying you didn't deserve it. but putting someone in that position that early was not fair to you either really. just try to be humble and learn everyone's best traits, leave the bad ones with them. so you see what I mean by the bad influences involved with that job, good. as long as you keep a goal to keep moving forward and leave that behind you'll be fine. i know a lot of guys, probably from immaturity, see what happens to everyone else and say "Yeah, but it wont happen to me". I bet most of the guys you see doing the wrong things now, said that too when they started.
just keep moving forward, sports medicine or whatever, and take care of you and yours.