Welcome, Youngdude! I hope you find A2K folks as helpful as I have.
Does your wife work? If she's staying home with 3 young children, she may well be depressed & isolated. You having to tell her to do everything sounds like she might be really depressed, which I know from experience is a very serious problem. Maybe she'd be better off working, at least some days, with the kids in daycare? Maybe she feels just as trapped as you do?
You've said you pamper her & she has everything she wants, while you work 2 jobs & get "nothing in return." Could you tell her this in a sort of gentle way, like, I'd really like for us to be happier together, etc. You really have to talk about this, in my opinion, as she is your life partner and deserves to know where you're coming from. Just distancing yourself won't solve anything.
Really I think a lot of the problem is you're both so young with so many children, and there's no way to solve that. All you can (both) do is deal with it the best you can. In-laws and babysitters can be a great help. If she's Christian, her church might have counselors. There are other options, too, like social outreach organizations that might offer free or sliding-scale therapy.
I can see why things might be hard for you both. But I think until you both work towards being happier together, the same things will come up year after year. There's a good book that might be available from your local library, called "Fighting for Your Marriage" that might help if you can read it together. It's a lot cheaper than a therapist.
Best of luck to you both! I hope you both find happiness.