As many have said here, you really don't know how things will turn out until you show up to flight training. Majority of the pilot wannabes show up to pilot training wanting to fly fighters. I think some try too hard, some just realize that they don't have what it takes, or timing just sucks. As for me, I just wanted to be an airline pilot. Though UPT was a lot of work but to my surprise, I excelled and could have chosen a fighter during assignment drop night. FYI, assignment drop night is held a few weeks prior to graduation and that's when you find out what aircraft you will be flying. Back when I went through, we chose our aircraft in order of class standing. Shortly after I was winged, the Air Force converted their way of assigning aircraft back to the old days where the IPs chose for you. Anyways, I chose a type rating on Uncle Sam instead. Besides, I didn't want to work 12+ hour days and fly 15-20 hours a month; not to mention a remote tour or two in the future. Yeah, I was one of those strange dudes, I guess.
If fighters are what you want, definitely keep your sights on obtaining that goal. People will tell you that you can't do that or you can't do this, yada yada yada. Don't listen to them-they are a bunch of losers themselves. Somebody is going to fly F-35s..... why not you, right? If you are dead set on flying fixed wing, your best bet is the Air Force, the Navy, then the Marine Corp IMHO. Realize that the Air Force has way more heavy slots than fighters. I would think the Navy will give you the best opportunity for fighters though they have their share of helos. Besides excelling in pilot training, it's all about timing and the needs of the service.
I've seen many upset dudes at assignment nights. Some even wanted to kill themselves-seriously! One common theme is that no matter what you end up flying, you will learn to enjoy and appreciate your airframe. There are upsides and downsides to everything. A good attitude will go a long ways, as always! Good luck and stay the course!