MYANMAR teenager Mya Thwate Thwate Khaing was supposed to be celebrating her 20th birthday today. Instead, she is fighting for her life in a hospital in the capital Naypyitaw after she was shot in the head when police cracked down on a protest against the military coup. Myanmar's army seized power on February 1 and detained elected leader Aung San Suu Kyi, ending a long transition towards democracy and bringing tens of thousands of demonstrators onto the streets. The shooting of the teenager - the first known serious casualty of the protests - has roused anger across the nation and…