Why am I still part child despite the fact I am almost 30?

When I was on a date, I ran so I could save us some seats before anyone else could take them. My date who was 33, just laughed at me.

I also drove and played around with a fire truck, yelled curse words at other cars over the microphone in the truck.

I can definitely be mature, I'm a medical professional and deal with human lives on a daily basis. But when it comes to personal life, I can act like a child at times

Why am I still part child despite the fact I am almost 30?
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