How should I tell her I want a divorce

Here is my story, been married for 22 years, plus 6 of dating, I am 46 now. for the last three years I have stopped feeling love for my wife, we stopped having sex almost after our daughter was born 9 years ago. The only four or five pecker kisses that we give each other a day, I do not feel anything. I love my daughter but i can't keep living like this, this lie. How should I tell her i want out, because we don't argue much, almost nothing, when she complains about something I did, I just shut up and take it. I don't think she knows how unhappy I am, and to be honest I do not want to talk with her about it. I am going to start seeing a therapist, I need somebody to talk about it, I can't talk to my elderly parents, they would probably get hurt by this too, and don't have any good friend I can discuss this with. The guilt of destroying this marriage, hurting my wife, my child,my parents is too much. But I am decided to do it. I though of waiting until after my daughter's birthday in a couple of months. I'd like to know if anybody has any similar experience, and to see how you handle it. Thank you all

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