...I am sixteen. :)
However, that's not going to stop me from giving myself some advice, because I think I could use it.
I need to practice the beautiful act of thinking about others before I ever think about myself, and listen to the words and instructions of the people older and wiser than I am. Finally, I need to stop worrying about the past and the future, or any problems that seem big now. Instead, I ought to focus on God's plan, and in Him, all worries and troubles fade away.
Question for the Reader: What words of wisdom would you give to yourself?
"Not that I have already obtained this or am already perfect, but I press on to make it my own, because Christ Jesus has made me his own. Brothers, I do not consider that I have made it my own. But one thing I do: forgetting what lies behind and straining forward to what lies ahead, I press on toward the goal for the prize of the upward call of God in Christ Jesus." --Philippians 3:12-14