Marriage isn't for me, but I'm already married.
Do you want out of your marriage?
I think that I'd rather be single.
If you think marriage is not right for you, you need to sit down with your spouse and talk things over. This has very serious repercussions that will last the rest of your life.
I don't know if I love her or hate her.
You seem to be having some mixed reactions to marriage. If you love your wife and you're both happy, why do you still feel like you are better off single? I really think it's time for the two of you to consider counselling.