Being a mature and responsible adult. I'm still living with parents because I don't make much money and I have to save up for retirement in order to avoid future homelessness. I won't blame my bipolar II or ADHD for it, it's due to my incompetence and is my fault.
In contrast, I was very good at throwing tantrums, asking for toys, making silly mistakes and generally being a child. On top of that, I was an expert in sucking mom's breast as a baby, according to my mom.