The memory may seem inconsequential, but to you it has meaning and impact. You were, as you pointed out, at an age when you were trying to assert yourself to become a young man, yet you were being treated like a child. Your little sister was getting into your space. Your mom was running late. Then the truck didn't start - more stress. Where did you have to sit when all of you changed cars?
And so on.
I have so many of those types of memories that come into my mind (or come from my mind) every day...a memory of standing in front of my 7th grade school, waiting for my mom to pick me up and her being (as usual) late. Was it abuse? Or a huge event? No, but it impacted me enough that it's still stuck in my thought process today.
I think it's great that you wrote out your memory here. I hope that doing so has helped diffuse it some.