To be used to / to get used to and used to

You want to say you are in the habit of going to the gym.

You want to say that when you were at university you read books.

At university, I got used to reading books.

You want to say you are developing the habit of studying every day.

You want to say when you were a child you played the piano.

When I was a child, I used to play the piano.

When I was a child, I'm used to playing the piano.

You want to say that you are in the habit of baking cakes at the weekend.

I'm getting used to baking cakes at weekends.

You want to say are developing the habit of walking every morning.

I'm getting used to walking every morning.

You want to say you worked as a cashier 4 years ago