Can you be declared a saint?

The Catholic Church does not make saints. Only God can do that. The Catholic Church simply does and intensive investigation of a person's life to determine if they are, indeed, in Heaven and worthy to be role models for Christians on earth. Any person who dies in a state of grace is in heaven and considered a saint but few of them are investigated to be officially recognized as saints. It takes a person who lived a life of heroic virtue to be considered for the title of saint.