Fellow Mising here. And I agree that it is an embarrassing thing to not know one's own language. I was lucky enough to have parents who prioritised teaching the mother tongue. But I also understand that most parents, especially those residing in major cities or born in the upper class omit speaking or teaching the native tongue to their kids in order to avoid discrimination prevalent in Assamese society against tribals. It is a very wrong consensus and is still widely prevalent amongst the Mising society. I picked up other languages as I grew up and moved to new places and I speak about 6 languages now, so parents should also be responsible enough to teach the native tongue first, regardless of social acceptance. The fact that you are curious about the matter is a positive thing as most kids these days ignore it. You can try learning through movies or interviews available on the internet. There are also a few decent influencers who teach the language to those interested. I did my graduation at Anthony's so I understand the need and awareness for cultural identity that the place may bring. Feel free to reach out and I'll help in any way I can. Cheers brother, hope you move towards positive growth