Not in my book. I only feel ashamed when I have done something wrong, when I have injured another person or animal. Crossdressing itself is harmless! If you steal clothing or deceive others and thereby harm them, then Yes shame might be appropriate. But if I don't talk to my friends about my hemorrhoids, masturbation, and lots of other "human" things it is not because I am ashamed of those things, it's because they are personal.