@Ana1136 I don't think not being nervous, eager or excited when meeting guests has anything to do with your approach being right or wrong. It has to do with your personality, whether one is nervous of how others might judge them, and how at ease one feels with strangers, among other things, IMO. I'm very casual with my guests, I just think of them as friends who came to stay, and feel confident that I've created a comfortable, clean, welcoming space for them. So far, all my guests have seemed to feel at ease and well-taken-care-of.
I've had guests who were a bit nervous at first, though. One guy, about 35 years old, first time Airbnber, really nice person- "So I've never stayed at an Airbnb before- do you have a curfew? (I host a bedroom in my home)" "Hey, you're an adult, it doesn't matter to me how late you stay out, just try not to make a racket when you come in." He was a great guest and we had some really interesting conversations.