If you a Christian but a pessimist, does that make you a lesser Christian?

Optimists say if you are sad then you do not have the joy of the Lord in your heart, they accuse you of not being close to the Lord, but then some of the most profound Christians (i.e. King David, Elijah, and even the pessimistic preacher David Wilkerson) were always full of woes, so is it true?