Stick with it, man. I did my first flight in IFS and thought to myself, "is this what I really want to do?" It was all new and wasn't fun (because it was hard and I sucked at it). Trust me, though, that when you get better, it gets more enjoyable. I think your feelings are normal, to be honest, even if it doesn't seem like others are feeling that way (they might be and are not showing it).
Also, just to warn you, Primary will be hard, and it will suck... until your solo. Although never serious about it, the thought of quitting crossed my mind a few times at the beginning. After my solo, however, I loved flying. It's one of those things that, once you get good at it, all the hard work and stress that went into the process comes out in an enjoyment and fulfillment in flying. I ended up finishing Primary #1 in my class. So... STICK WITH IT!
To answer your questions...
Your time commitment started when you were commissioned. Theoretically, if it took you long enough, you could get all the way to just before winging and get out of the Navy because your commitment is up.
DOR's (from a-pool, API, Primary, etc.) usually get stash jobs for a bit while they try to redesignate. You put in a package for what you want (seems like most go for restricted line jobs), but are at the mercy of "the needs of the Navy." I don't know who this all applies to, but a guy I know wasn't able to finish Primary, and they told him he's on a standby list for the IA program for 30 days, but they also said it's a very low probability that he'd get picked up for it.
Hope this helps.