I think I need to leave and start a new life?

I am 28, married with a daughter whom I love to the ends of the earth. The problem is I'm just not happy with my life. I'm not happy with him but we put up with each other. We bicker a lot and I know I am really destructive for him - he is losing more and more confidence because of me. I need more from life and he can't give it to me and I am miserable too. I really think we are destructive as couple but cant think through all my options. Stay and change him - that's not fair on him. Stay and change me - that's not fair on me. leave and give us both a chance to be happy. Really sad. Please help