So my family is kinda pissing me off with instagram lately

Basically my parents wanna see my drawings I post on my instagram account bc they don't have instagram. I explained to them that I don't want them to see my drawings because I wanna have a social media more close to people my age, like friends or siblings. If they want to see some of my drawings, they can just ask me. I post pop-culture drawings and memes, and I REALLY don't want them to see that and have to explain to them their meanings.
I explained this to them 3 TIMES.
But they still don't understand. And my ą$§høłē of a brother tells them about everything I post, making my parents furious or confused. He keeps teaching my relatives how to use instagram.
Today he teached my grandma to use instagram, so now she can see gore art and other dark humor I post.
... I blocked all of them.
Am I an asshole for not wanting them to see my posts ?