Corrections:
In my opinion, personalities are shaped by both genetic and environmental factors.
I’m shy and my daughters are shy too. They might take after me in personality.
My brother was also shy when he was little. My mother often took him to the park and helped him to make friends. As a result, he gradually became sociable. Now, he has a lot of friends and is a very cheerful person.
Expansion:
In my opinion, personalities are shaped by both genetic and environmental factors.
For example, I’m shy and my daughters are shy too, and I often wonder if they have taken after me because I have passed my personality genes down to them.
On the other hand, my brother was also shy when he was little. But my mother often took him to the park and helped him to make friends. As a result, he gradually became more sociable. It seems his upbringing could overcome his natural tendency to be shy, and now he has a lot of friends and is a very outgoing person.