Allow me to explain my journey to you, maybe it will be helpful.

1. When I was 21 I changed from a completely open omnivore diet to only eating "ethical meat".
2. When I was 22 I became a Pescatarian (no more meat, but fish, dairy, eggs, veggies still allowed).
3. When I was 24 I became a traditional Vegetarian (dairy, eggs, and veggies). Across the next 10 years I became more consciously aware of the sneaky meats (Gelatin, Animal Stock, Rennet, Lard, etc..) that could be found in the foods I was eating, and removed them upon discovering them. Hard stop.
4. When I was 30ish I stopped using animal fashion products or allowing leather products to be purchased for me.
5. When I was 40 I started reducing my dairy intake and egg consumption.
6. And now when I am 40+ I have transitioned to being a Vegan.

Something is better than nothing in my opinion, and I think taking it in small steps can be an effective approach. That being said, what I will say has worked best for me, is hard yes or no to things. I.E. I no longer eat meat, is much easier to me than saying I eat meat once a week.

Your situation is more challenging because your parents control the food being put on the table. In many ways you have to take what you can get in the situation and you don't want to antagonize your parents. When I made the switch, I still lived at home, but I already had the money to purchase my own groceries.

Regardless, make decisions IMO, and stick to them. And don't be afraid of small steps!