Write A letter(epistolary form) giving advice to a younger person.

Writing a letter to a 16 year old from a 20 year old. Advice on life experiences. What are the goals you have set for yourself and attainment of which you believe will lead to happiness. how do you use this information to form your own position? Has your view changed from when you were younger. Include the struggle with academics in high school and how its better now in college.