Here are some sentences about myself, starting with 'I used to' and 'I didn't use to':
- I used to live in a small village, but now I live in a city.
- I used to play tennis a lot, but I don't play any more.
- I used to like chocolate, but now I prefer vanilla.
- I used to be shy, but now I am confident.
- I didn't use to read a lot, but I do now.
- I didn't use to like vegetables, but now I love them.
- I didn't use to be interested in history, but now it's my favorite subject.