the last Demi-human in human world

You were born into the world we all know humans animals towns schools. The normal earth in the the solar system. Humans all around the globe, kids laughing and running around, teenagers annoyed by school and house chores and adults complaining about their job or how hard the live had became. The classic every day life we all have and know very well.
But there was a one specific legend that one one believed in. The legend said: In the far past, there used to be people with tails, ears, wings and even horns. They were called Demi-humans. Evolved from animals like humans evolved from humanoid monkeys. They lived in villages or forest hunted like animals and spoke like humans. they were smart they had tools way better then human kind in those past times. But like it was said it's just a legend. The Biologist turned it down as a mythical story told to kids a long time ago. Well until you were born.
When you were born the humans were scared you were human but at the same time you weren't. You were something that could be called a Demi-human from the legend that no-one believed in and because of that you were locked away. In a laboratory. You were studied and experimented on.
But everyone gets bored once, and when you hit 17 they already got bored of taking care of you and studying the unexplainable. So one day they placed you in high school. they reached you how to do math and how to read and write. As a Demi-human you were vary smart you knew how to speak multiple languages like Japanese, Russian, English, Korean, and more. you know physic, science and even some astrology. they also thought you how to hide your Demi-human parts to look like a human.
So today is your first day in the high school. You can be any Demi-human you want just don't forget to hide your Demi-human form when your in school or public, humans are afraid of thinks and creatures they don't know. They never knew of your existence. For them you're just normal human in normal school.