"It's my life, and I can do what I want with it!"

Dad: "NO! It's NOT your life!"

Teenager: "Yes. It is and I can do with it whatever I want to. I can even end it."

Dad: "Did you start it?"

Teenager: "No."

Dad: "Then it is not your right to end it. And by the way your mom and I did not create your life either.

Your life is a gift. Your life is not for your own pleasure. It was given to you for a different reason, it was given to you so that you could discover your true purpose, your true identity."

Teenager: "WTF are you talking about?"

Dad: "You have a purpose, and your life was given to you so that you could discover that purpose, so go find your purpose! Don't be a coward and give up before you've even started. Before you know who you are."

Teenager storms out of the room, mind blown. 

The conversation is just starting. There is much the youngster still has to learn. "Your life is not your own" is just the first obstacle to overcome, and is perhaps the hardest, but also the easiest. There is no possibility of redemption or salvation until you understand that this life is not yours, it is the property of its creator.

It is the glory of God to conceal a thing: but the honour of kings is to search out a matter. The heaven for height, and the earth for depth, and the heart of kings is unsearchable. Take away the dross from the silver, and there shall come forth a vessel for the finer. Take away the wicked from before the king, and his throne shall be established in righteousness. Put not forth thyself in the presence of the king, and stand not in the place of great men: For better it is that it be said unto thee, Come up hither; than that thou shouldest be put lower in the presence of the prince whom thine eyes have seen . - Proverbs 25:2-7

On the Day of Judgment, Jesus is our Redeemer and Savior, there are no accomplishments a man can present before God and be declared righteous and worthy. Only Christ is able the be judged and found worthy.

Your life is not your own. It belongs to the Creator. It is redeemed by His messiah. Your purpose is to accept this truth and repent.