I want to shave my head

Ok, so I have wanted to shave my head since the beginning of  high school, I am not worried too much about how people will react to me or how I look because I am doing it in honor those with cancer and since my Aunt was diagnosed it only furthered my reason. The main fear I have is either my hair not growing back at all or my hair coming back as a different texture. Again these problems are minor I won't die if my hair dosen't come back but my hair has never been shorter than what it is currently so I have a few concerns. Thanks ^^