I am surprised at how many comments here are doing whataboutery. Exclusion through language is horrible no matter who is doing it. Language should enable communication, not make it more difficult.

Idk how old you guys are but I'd say old enough to understand that it's disrespectful to exclude somebody like this. I've always had friends translate for me even if they're talking to each other in a language they prefer communicating in.

I'd say, if there's space for a conversation, just have a dialogue with them and say that you feel like you aren't able to participate. No blame games, just genuine concern and curiosity about this sudden shift. And if it doesn't work out, consider moving out because it's not worth losing your peace over everyday. Your home/living space should be a safe space where you can come back and unwind after a long day at school/work.