How do I come out to my wife/family

I 27m had a life changing moment where I feel like I’m gay. I’ve been married for 3 years and my wife just interested anymore… I’ve grown to see that I myself isn’t who I use to be. I’ve become someone I’m not. Even the intimacy that I share with my wife isn’t doing it for me anymore. But, I have been gambling with the idea of a man… and it really excites me. But I don’t know what to do.