I don't want to have kids.
Why don't you want children?
My parents were very mean to me as a child.
It is good to be honest about wanting or not wanting kids in your life. But having bad parents doesn't mean you will be a bad parent in turn.
I'm still thinking about it.
Okay, it's fine for you to take as much time as you want for such an important question in life.  But I would advise that if you enter into a serious relationship, that could lead to marriage, you should be open with your partner about your doubts.  It would not be fair to commit to someone who definitely wants kids, if you might not be on board.