I'm going to give you the same advice that I wish I had listened to when I got to my first Navy vessel; how miserable your life is is more a factor of attitude than circumstance. If you show up to work ready for a bad day, there is a pretty darn good chance that you will get it. You show up with a good attitude and you might still get a bad day, but at least you've got a fighting chance.
When I showed up to the boat, I was the gung-ho, can-do, ready to face the world sailor. As time went on, and a change of command, the rigors of the boat started to wear on me. My attitude started getting worse and worse until I was hating life every day. Luckily, I had one of those epiphanies and I turned myself around. Sure, my command was still beating the crap out of us, our hours were long, and my every effort was being sneered at; but I decided that I wasn't going to let them drag me down. A few months later we got another new command, as often happens, and things were great. Work/life balance meant something again. Now throughout all three commands there were those with a good attitude and those with a bad one. The only difference between one guy and the next was how happy they wanted to be.
Is it going to be hard? You bet your backside it is, but anything worthwhile is. You will have trying times when you are doing everything right and still getting yelled at, sleepless nights that end in field-days, times when you screw something up and think that you will never recover from it; and those times suck. But, you will also have homecomings, port visits, stories to tell that only a select few could possibly understand, and you will wake up days recovered. Go with a good attitude and your time will fly, and maybe you'll even want it to not end.
Good luck and keep us posted.