Why I can never keep up with the trends

I always get fixated on some particular items of clothing that I see other people wear that I really really want, but by the time I get around to actually shopping for them, they are out of fashion and no longer available.

Also, why am I only ever in a really good mood when it is detrimental to me? I am sick, I have a shitload of work to do, everything that was due this week is now late, I have skipped a ton of mandatory classes, and yet I am fluttering about with a big, idiotic grin on my face and with no motivation to do anything but stare happily at my fingers.

It must be the drugs.