I want to practice singing to build my voice but I don't have a space to do so since my family doesn't like any noise in the house.?

I don't have a car, or a soundproof room, a pillow doesn't work either. I also don't have access to private rooms at school since I go to an art school where the actual vocalists use the studio spaces all the time after/before school. Where can I go to practice? Is there a way to make a soundproof space?
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