I am not in your position, but I was a child who's parents divorced after about 15 years, and I can still remember how I felt, even though I was only 7 years old. Please, if you are really unhappy in your marriage, then forcing yourself to stay, will make things worse for your daughter. She will pick up on your unhappiness, and it will cause her unhappiness. I am not saying to separate. Look back at when you first fell in love with your husband. What was it about him that you fell in love with? Is that still there? If so, then why don't you love him anymore. Talk to him and let him know how you feel. Communication in a marriage is really important. If you find you cannot talk to him in person, or say what you feel, write it down in a letter and give it to him. Remember, words say a thousand words. I hope things work out for you, but remember for your daughters sake, and yours, you need to stay happy. Good luck.
Mother of 3, Qld