Flashing Back To Sixteen

So, I'm visiting with my mom and stepdad. It's supposed to be wicked hot so I'm wearing my beautiful one-piece swimsuit and my jean shorts.

Mom- Chris, are you coming with me to the grocery store?
Me- Yeah. (I go get my purse and put my sneakers on.)
Mom- Are you going like that?
Me- Yeah.
Mom- Go put a shirt on.
Me-(staring at her.)
Mom- You're not coming with me if you go like that.
Me- Fine. I don't need to go to the grocery store. (I walked back to the room I'm staying in and put my purse back down. Um, how old am I?)
Mom- No, come on. I don't care. Come with me."
I went. But without the shirt.