Well then I do have one advise. Do get excited. And next time it happens, scream a little. Laugh out loud. Hug the person next to you. "There is no growth in comfort".
It's not that I don't appreciate something, or find something funny, or scary, &c., it's that I don't demonstrate it as enthusiastically. I have the same range of enthusiasm, I think; the scale is just smaller. (It's probably a good bet that I actually don't get excited as easily as many, but that's harder to verify.)
It is a bit awkward to try feign enthusiasm just to fit in. Fortunately those who know me better can interpret the subtler changes in mood.
Literally, we can't. You may as well be asking us to detach our arm.
Ever seen Mythbusters? Think Jamie.
If anything, I relate to the OP. When everything "is super exciting", nothing is. We already live in a world filled with over-stimulation and kids growing up to thing that "to have fun" is the only important thing. I wish we had move people that manage to keep their cool like Gabriel, instead of writing something that makes him look like a downer.
There's an interesting chapter in the book Hyperbole in English (http://www.amazon.com/gp/product/0521766354/ref=as_li_ss_tl?...), Ch. 6 on Conventionalisation, on how, with some words, what started as hyperbole has caused a meaning shift such that later users don't always perceive themselves to be using hyperbole, but just to be using the contemporary meaning of the word.