Well, pretty much the only bad thing about my childhood was my mental illness struggles. I've dealt with psychosis and depression from a very young age and as a result I grew up never feeling safe and feeling very isolated and separate from other people. My parents weren't really supportive and didn't get it or know half the things I was going through so it made me not trust people very much or rely on them when it comes to emotional support. They were both very much "rub some dirt in it and get over it" people. (In all other areas though they were great parents, and were very supportive over things like our interests and goals.)Also now that I am an adult they have learned from their mistakes and really try to be more supportive and understanding now.
Unfortunately dealing with a childhood of mental illness alone has left me a traumatized adult. I still struggle. But I know I am loved and have a good support system around me. Also I was very spoiled by my parents, my mom especially, so I don't really know how to take care of myself or do anything useful because it was always done for me. It's driven my friends sort of crazy when I lived with them at college, but I am gradually learning. My parents also taught me to be polite and friendly in all situations, which is good and bad because it made me very well socialized but also taught me bad emotions should be repressed because they are inconvenient to others. Those are the main things I think.