Do you want people to forgive you for your mistakes? I'm sure you are not perfect and you will make mistakes too that will hurt people, and it could be your own children. I'm sure you won't do it on purpose- Mistakes happen. What you thought was best at that time turned out it wasn't and it hurt someone. Do you want that someone to forgive you?
Also on the Day of Judgement do you want Allah to for forgive you? Then learn to forgive others.
Heaven lies under the feet of your mother. IT's not the other way around, so it would be to your benefit to forgive as many people as possible.
You say you were spoilt as a child. That means you parents gave you a lot more then they should have. They made one mistake, and you can't forgive them for that? Be thankful for the parents you have. There are parents out there that kill their own kids, sell them to prostitution, abuse them to a scary point.
Parents aren't perfect. They are human- just like you. You won't be the perfect parent either, so deal with them as you would want your child to deal with you. Yeah, yeah I know you're thinking "I won't ever to do that to MY KIDS, blah blah," but I'm sure that's what your parents thought that too when they were kids, when there parents did something wrong. Why don't you focus on things that your parents did right. I'm sure it outweighs what your parents did wrong.