Hmm let's see...I have done several of these!
bought a pair of expensive shoes in the wrong size that I can't afford "because they are so fabulous." - No, not done that one!
sneered at someone for not wearing the right designer label. Or been sneered at, come to that.- No
eaten a whole tub of ice cream in one evening - Yep, Ben & Jerrys Cookie Dough..definitely a few times I've made it through a whole one.
woken up in bed with a complete stranger - Yes 
spent all day getting ready for a date - Yes, a few times! but to be fair that included hairdressers, nails etc.
tried on every outfit I own before going out, leaving every item of clothing draped around the bedroom (sub clause: then wearing the first thing I tried on) - Yes, have done this!
obsessed about whether a man would ring me or not - yes!
given genuine thought about on which date I should sleep with a man, rather than letting my horniness or lasck thereof decide for me. - Yes
Spent all day in bed wallowing in dating-related misery - Yes, along with the aforementioned Ben & Jerrys!
pretended to be sick to get a day off work - yes!
I am 23 btw! 