Does the language which they teach you in actually matter?

I joined an institution specifically catered for Acca students who are high school graduates (from Nepal ). I’ve been there for one day and what I found odd is that they teach it in the native language Nepali which I do understand but I’m concerned since some subjects are theory and concepts based and the input you are learning in lectures is all in some other language how will it work? I feel like I made the wrong choice pursuing Acca right after high school and I have concerns of missing out on the college life as well since now I’m studying in a coaching Center not college. I told this to my parents and they are fine with me doing whatever I want so I’m really conflicted right now. Am I overthinking or is it a real concern?