How do I tell him that I'm not interested

I've been dating this guy for about a month, and I think he is an attractive person but I'm not attracted to him, and I don't want to go any further in the relationship. This is also my first "relationshipy" experience. I want to tell him face to face, like he deserves. I'm tired of "ghosting people" 🙈
Do anyone have advice on how to go about this?