I normally hate mission statements. Ideally, a mission statement is honest, written well, to the point, helpful, and something that directs the group on a daily basis. As far as I can tell, no mission statement actually meets all those criteria. Personal, as opposed to organization, mission statements are even worse. They're usually so grandiose and vague that there's no way they can actually direct a person's energy and actions toward a better future. To my thinking, a feasible and actionable to-do list for tomorrow is almost always going to be better than a big fuzzy mission statement that covers the next three years.
But the thing is, college admissions season is actually a pretty good time to write a mission statement.