Is a world without any animals except humans possible and what would be the impacts?

I'd like to know if a planet without any animals except humans can exist. The cause of this absence of other species could be anything but the humans should not have any social interaction with something else than humans for centuries.

What would be the effects on the society? I guess that humans can live without any animal nutrients but can the global ecosystem be rich enough for humans without interactions with other species?

Do Humans have to be highly developed in order to live in this kind of planet or do you think people from Middle Ages could live in it?

How would this kind of world affect our personality? Humans tend to feel close to the animals. Would a lack of other animals cause us emotional distress?

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Is a world without any animals except humans possible and what would be the impacts?

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