Friend problems

It feels like I'm being outcasted from my friend group a little bit. They often speak in chinese, which I'm not fluent in so I often can't join in on the conversation and they usually only ask me things about hw. Everyone else in my class are friends and it would be awkward to just barge in their friend group. I wouldn't fit in most of these friend groups anyways since most of them speak chinese a lot. I've also noticed one of my friends starting to get more irritable and I'm scared to respond to them whenever they talk to me sometimes.