Left the navy after six years, because I did not want to go back to the extremely long hours. While in, tried UDT, PBR's, SWIFT, even tried drinking way too much, nothing worked (the drinking almost did but I cam to my senses). My non-nuke command was going to recommend me for warrant, but from what some have said here, that would not have worked. The line officers were also locked in until they had sufficient rank to be an XO, but that may have changed. I remember a guy who got busted from E-5 to E-4, still a nuke, then he thought, "Hey, if I get busted to E-3 I am gone!", the command said "No, if you are busted to E-3, in addition to your nuke assignments, you will be required to work the mess decks". I don't know if the command was bluffing, but it got his attention and he guy squared away.
When I was in, the nukes who dropped out of school or prototype, got orders to Alaska, or Gitmo, or such, and still had the six year commitment.
Tough it up, your attitude will change after the four year hump. Do your best and get rate as fast as possible. It will all be over before you know it, and you might even have some fun and gratification while doing it.