I'm In A Bad Mood

Recently, I have planned to volunteer at the zoo near my house for a Halloween attraction. I was getting super excited, but then when I got home from school, my mom said that the volunteer cordinator had called and said that I have to be over sixteen, which is a problem, because I'm not yet that old.
Afterwards, I was in a terrible mood. I locked myself downstairs and had a good cry.
At supper, I was just sitting there and eating my pizza when my brother turns to me and says, "So, if you had volunteered there, what would you have been doing?"
I turned and glared at him to try and send him the message to drop it. Meanwhile, my mom is nudging him trying to tell him to stop.
But he doesn't.
"It would have been so much fun volunteer there."
Stop. Just...stop.
So, have any of you had an experience like this?