Flat, like a tire or a ball thats been run over

SO I get this feeling sometime and it's like I am flat, I spend so much of my time, trying to be wacky and immature and happy, that suddenly I run out of steam, kinda like a basketball thats been bounced a little too often. I feel deflated and sad.
This is how I feel like now, and I dunno why, I guess I find an amusement in such menial things that I forget about them when something more important comes along.
Like at the moment it's exams.
They stress me out and I forget about crunching leaves, and jumping in puddles and doing those immature things I do. I hate it that suddenly my little amusement is dwarfed by something big. Its kinda like the sun against that huge star in that documentary that was fucking awesome.

That's really all I wanted to say.
Also I am writing a book, cause I feel like it.