help:should i say :i am a chinese or i am chinese

help:should i say :i am a chinese or i am chinese I am a Chinese. i am proud i am a chinese I am a chinese还是I am chinese正确 是i am a chinese 还是 i am chinese I am a Chinese还是I am Chinese I am a Chinese和I am Chinese哪个对? I am Chinese.I am a Chinese.哪个句子正确 i am not chinese i am nativer chinese i am chinese.where_from? i am proud i am chinese