I became a vegan.. How to deal with disapproval?

I've recently progressed from Vegetarian to vegan (about three months ago) and people who are just finding out look at me with disapproval. I know it's normal to be curious about it and I answer questions all the time, but how do I deal with disapproval? even my mum is urging me to eat meat &drink milk and stuff. It's a personal choice and something I want forever, How do I get them to back off?
I became a vegan.. How to deal with disapproval?
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