How do I be vegan in a vegetarian household where dairy is non-negotiable as a teenager in india?

my parents force me to eat dairy products because its good for my health, which it is, but there are alternatives. every day my parents make me drink tea and they put ghee and butter on almost everything. i have tried to stop eating ghee and butter and i never really eat cheese or paneer but its still very hard because my parents, while vegetarian are vegetarian not because of ethics but because of religious and ancestral beliefs and hence the concept of veganism is extreme to them and they never listen or are ready for debate. I have tried everything but they force me to drink tea and milk and I feel extremely guilty every time.... I’m financially dependent and can’t fully control groceries or cooking. I’m trying to reduce dairy as much as possible without creating constant conflict.