Just imagine that u r writing a letter to your 45 year old friend. you just hv to express that what you wish to be like in your future and what u r today ( means you at your present age) . for eg you can write that you always wanted to be a doctor but you r not a doctor , you r in a proffesion in which u never wanted to be. I hope u understand what u hv to write in letter and if you r still confused I will help you.
if you understand than mark this answer as brainliest....plz