Leprosy
When a girl asks you to treat her like a princess so you marry her to a stranger to strengthen the alliance with Poland. Something that is normal today but would be wierd in medieval times is washing.
The church controlling your entire life.
If they decreed you were evil you were fucked. Now you can tell the pope to fuck off and people will cheer
Having people help you get dressed and undressed as an adult.
Soldiers raping every single women in town/village they just passed through.