The thing to ask yourself is what exactly it is that you don't like about YOUR marriage. Because that is what you are talking about. YOUR marriage. Not marriage in general because everyone's marriage is different.
So what is it that you don't like about your marriage?
Is it that he is messy? That you have to share your bed? That you have to be responsible to another person? That you have combined finances?
Once you have the answers to this question you can start attacking each issue. One at a time. See what can be fixed and what can't be. Perhaps enough of your issues can be fixed that you might start enjoying your marriage again.
Good luck! Mitzi