Keep the person who criticizes you as your brain.
Such person is actually very valuable to you.
I'm a Japanese international student studying in Canada. I am trying to improve my writing skills in English by creating this blog, so if you have time, please correct my English. It'll greatly help my writing. Oh, you can write your comments without correcting my English, but please don't use the space for advertising... ( By the way, my older blog and the Japanese one are here too. http://www.sasakukublog.blogspot.com and http://www.sakunikki2008.blogspot.com ) Thank you.