mamshtakah: from my experience with dor yesharim in high school, no one is forced, there is pressure to do it but no one is forced. I had a friend who’s mother was insistant that her daughter have her blood drawn in a sterile environment, not in some office at school. Then there were the complete sephardi girls that didnt take it at all and there were a couple of girls with mixed ashkenaz/sefard in the family tree so they did take it.
Its really nothing to worry about. Its in and out and thats it. Of course its fun to make a big deal about it, so maybe do the whole song and dance about how nervous you are and then you will be pleasantly surprised about how easy it was! 😉