By the age of seventeen they have tried everything, but they have not found the happiness they were searching for so they take their own lives. God created us for a purpose. We know from philosophy with absolute certitude that every agent acts for an end. For example, during rush hour the highways are crowded with cars and every one of them is going somewhere. Each driver is directing his car to some definite place or he has some reason for driving, even if it is just the joy of driving.
Every agent acts for an end.
The same principle applies to Almighty God. As we say in the Catechism, he created us to know him, to love him, to serve him in this life and to be happy with him forever in the next life. Man is made in the image of God and he has great dignity because God has destined him to share his own abundant life for all eternity. Of course, there are also those who, erroneously, deny the reality of sin and hell and so think that everyone goes to heaven no matter what he does in this life. At present I am not concerned about that particular error.