Can i use decrative tile board in my shower?
Yes you can.  This is normal for bathtubs.  However note that there are tons of different grades of tile board, ranging from touch it with a watch and it scratched to some commercial grade boards that are pretty resistant.  I have no idea what quality yours is so just note that the coating and material itself (what material and thickness) is way more important than how it looks in some picture on a website.