#1 Dont hang anymore with the idiots and ignore them, you dont neef them

#2 Sharing nude images without consent is a crime in you country

#3 Nobody really does care or want to see your weird shower nude pictures

You are fine, looks like some assholes and thats it. Its no big deal* dont give it any importance and ignore it or/and pursue legal action if needed.

Also, avoid drinking that much and be positive, this is nothing really