Sorry to hear you living with a bunch of lunatics! Your nervousness seems to encourage his behavior even more!
Here’s what you do. While he’s checking you in, calmly call the non-emergency police dispatcher on speakerphone and tell him he’s doing it. The dispatcher will tell you what he’s doing is illegal (especially since you’re under 18. It could be even worse because you’re underage) and your stupid uncle won’t just hear it, he’ll be permanently recorded.
Also, since summer is coming, get a job at a movie theater to earn money that you’ll save to pay for an apartment in 2 years.