No one is or can be a Buddhist, it’s not a religion. It is a set of beliefs, state of mind and life style. But you can be a monk, which is good for those who want to reach enlightenment — only monks can, funnily enough :) their main idea is to shake the chains of the mortal world, to live not because of whims of nature or your body but your own. To reach the state in which nothing really bothers you anymore :)