Fat and Aggravated

I’ve been trying.  Really, it has been quite hard actually, and it makes me wonder if I am getting old .  I’m going to be 23 in May and I want to be thinner by my birthday.  So, the background is that I’ve been killing myself food-wise lately.  The last 5 days I have been eating this: Slimfast and apple for breakfast, Slimfast and carrots for lunch, salad with carrots, cucumber, and baked chicken (no skin) with light dressing for dinner.  Drink lots of water (at least 64oz/day).  I’d eat up to 2 Luna Bars a day, depending on how hungry I was in between "meals" (if you can even call them that).  Now can someone please tell me how when I weighed myself this morning I have not budged even an ounce?  Nothing.  Nada.  Not even a drip of water weight has fluctuated.  I do an hour and a half of yoga twice a week and I work 8 hours a day where I’m on my feet constantly after attending classes for at least 3 hours, so it’s not like I’m sitting in front on the tv for hours on end.  I’m barely home and I barely get a break.  So again someone please freaking tell me where this weight is that will not budge?  I guess back in the day my weight fluctuated easily.  In high school I starved myself to stay average sized, and for freshman and sophmore year of college I ate once a day to stay average.  Over this past summer I was somewhat careful of what I ate, but not really and I didn’t go up.  Now, I have gone up 15lbs and it won’t move!  I don’t know how nothing can change, not even an ounce when I’ve been eating the way I have.  I mean, come on, how can I not lose anything??  Arg, I have to go, but I hope I conveyed my aggravation.