@shelly542012,
It think that couple's counseling and marriage relationship classes would be a good idea. The need is urgent. Both of you need to take a good hard look at behaviors. This will take some time.
In the meanwhile some compromises are in order. Can you got some help with the kids and/or the housework laundry chores if for no other reason than to take a break -- even for 2-4 hours per week. that can give you the break you need to get refreshed and have alone time.
If you don't you'll burn out for certain. I'd think about couples counseling seriously if I were you. Your both are young but so you can both learn a new way of relating to one another before it's too late.
What is most likely best for kids is to have the love of both parents in a peaceful harmonious setting...either as a couple or separately.