No one understands me

I hate when I'm not taken seriously, either because of my age, or because normally I act silly and boisterous. Because that's how I am on the outside, no one ever thinks I'm capable of being serious, deep or having provoking thoughts or ever being near to thinking like an intellectual. This annoys me to no bounds, because all the times when I'm alone, I am like that, and to be told or scoffed at when showing this side in public, it's extremely aggravating. I hate it. Whatever I am, or whatever I show is only a side of the story, and maybe if you heard all of it, you might actually understand it.