Hello Black Sesame,
I am late in the game but I just came upon your post and since I face exactly the same issues with my family, I thought it wouldn't hurt to answer anyway.
So basically, for the last 2 months and especially around Christmas, my dad was all over the fact that I might have a boyfriend this time next year. That I wouldn't spend Christmas at their house anymore. Stuff like that. Every time I would just walk away (one time I went to the basement, trying not to scream in desperation to be quite honest), because in fact I still don't know exactly where I stand with my romantic orientation - I am pretty sure I am aro, but it takes time to fully accept it in an environment that expects everyone to marry, buy a house and have 2 children. I am just not ready to have this conversation with my parents but I keep telling them that I am fine and happy on my own. Which they don't believe, in fact I think my dad assumes I am a lesbian.
So I guess I can't really help you besides giving you a heads up, that I know exactly how you feel. It isn't easy, but we will get through it, I suppose. And some day, if you feel like it, you can sit down and explain to your dad how you feel and what your goals in life are. And if none of those are about getting married: It is your life and not your parents!
Ich komme übrigens aus Österreich, woher kommst du? Ich hab mir schon bei "Beuteschema" gedacht, da ist jemand deutschsprachiger unterwegs, was du später ja sogar bestätigt hast :) Wenn du dich austauschen willst schreib mir gern eine Nachricht, ich würde mich freuen. Es kann manchmal einsam sein, wenn man niemanden kennt, dem es genauso geht..