It is your property, but it's not your sovereign country. You still need to obey the law of the country your property is part of, and that severely restricts what you can do with it.
It is not your property. If it were your property you could build whatever you wanted so long as you don't bring harm to others. The word you're looking for is not property owner but "tenant."
Property is a concept, different people can have different conceptions. I'll take your word for it that your conception is a delusion. You can't speak for everyone else though.
