Um, I sympathize, but in a klutz-off, I would win the golden ass, believe me. I must add that only my love of dance keeps me in ballet class, for by now - about 500 classes into the experience - I know that I will recycle forever as a beginner.
If my own experience is any guide to go by, do not expect to acquire coordination or athleticism in ballet class, nor in private lessons, either. These are not skills, they are innate qualities, and you either have them or you don't. You may improve on them somewhat, but you are setting yourself up for disappointment if you expect great improvements.
Now, that's not to say that you can't expect great improvements in any areas. If you apply yourself, you will become more fit than you thought possible, have greater stamina, and more flexibility. But know, also, that with rewards like these comes an element of risk, for it is possible to seriously damage yourself, knees and ankles, especially. (This is why most men who dance professionally are at or near retirement at the same age, 30, that you contemplate taking up ballet.)
But, if you don't take the advice of this glum chum, go instead to www.balletalert.com or www.danceart.com or www.criticaldance.com. At any of these three similar websites you will find much more and better information than you are likely to receive from this Parsimony board. The good people at those sites can tell you what to do in and expect from ballet class, as well as recommend any good schools or instructors that might be appropriate for your situation.
-V-[/i]