Parents, we accelerate or stifle…release or repress, our children’s giftedness. They will spend much of life benefitting or recovering from our influence. ~Max Lucado
If you didn't have a good example of how to parent, you can use that as an example of what not to be. Don't waste time being bitter, get busy! Get busy finding healing in Christ and learning how to be the best parent YOU can be. I often think a bad example has a more profound impact because the child turned adult has learned the damage that can be done first hand and is careful to not do that to their own children.
Proverbs 14:1 The wise woman builds her house, but the foolish pulls it down with her hands.