I'm sO Mad RiGHt noW I feEl LiKe cRyIng

So one of my favorite subjects this past year was Chemistry. I was planning on taking AP Chem this year, my senior year. I was told last spring, by my counselor, that that would be just fine because I passed Algebra 2 with such high grades (not to mention Chemistry). So imagine my surprise this fall while registering for classes, when AP Chem is not on the available class list. I emailed my counselor very upset and asked what had happened. He emailed me back and told me I couldn't take the class, no explanation or anything. So when we went in to talk to my little brother's counselor, we asked about AP Chem, and she told us that AP Chem wasn't full and she could put me in it if we went and talked to my Chem teacher first to make sure I was up to it according to him (she also said that my counselor believed in having students take Biology, Chemistry, and Physics and I haven't had physics but that shouldn't be a problem if I was OK with out it). We talked to him and he explained that there were so many students wanting to take AP that they were having to limit the admission, so they had four slots open, and a waiting list for those slots. He told us that because I am a senior, and I have finished the minimum math level requirement (Algebra 2) that I would be top of the list. He told me that just over two weeks before school starts, he also told us that 1. I should email him so he'd remember to put me on the list, and 2. It would be decided by the following Thursday (yesterday). When I didn't hear anything for most of the day yesterday I emailed him and asked what was going on, and he told me that he was sorry, but I hadn't made it into any of the four open slots. I DON'T UNDERSTAND HOW I COULD BE TOP OF THE LIST AND STILL NOT GET IN! Can someone PLEASE explain that to me?!? Other then that life has been great... except the staying up til three to clean my sister's apartment (fun but late) and the not being able to see my friends because I lack a car, and they lack Driver's licenses (still, at almost 18) and the dishes, which are a mess. and the fact that I haven't eaten enough today and my blazer and my school tie disappearing. oh and lets not forget the fact that I hurt all over and won't see the chiropractor till Monday. To top it all off, I might not be able to dance next year. Something about not making my brothers wait for me after school since I'm the driver.