Hi new/old,
That was a really interesting and good first time out-of-body experience!
That's how it feels....the 'real you' suddenly realises that it isn't that body at all. It takes it off just as easily as we take off a coat. And when the coat is taken off, we walk away and never feel that "we are the coat" haha! Although the 'coat' (body) is a useful thing.
It always feels somewhat shocking to get out for the first time. Wondrous but slightly shocking too.
Don't worry too much about seeing things floating. Doesn't mean other Beings were messing about or anything like that at all. Usually when we first step out it's into the denser environment surrounding the physical world. It's a much finer dimension than the physical but really dense compared to the Astral levels. It's also quite an unpredictable environment where weird effects can happen. (Such as seeing the room completely dark when you know it's daylight outside....seeing pictures on the walls, where you know there are no pictures....finding yourself suddenly wearing jeans and boots, even though you know you went to sleep in pyjamas and bare feet (lol) or some other distortions of what you know as normal reality of your room or environment.
Once I went out and saw the overhead light-shade from all angles at the same time (peculiar experience and almost indescribable!)
Your experience sounds amazing actually for a first time!
The purpose of the experience? To show you you are a multi-dimensional Being and that fact is freaking real and 100% tangible! wow