Rewinding time

Hello everyone, i just joined this website but have been constantly reading these articles. I just wanted to ask all of you guys if you could rewind time to when you were a teenager or 5 years younger, what would you do differently and what wouldn’t you do differently? I’m intrigued because I am going to start a new college soon and I guess I’m nervous about what decisions i will make and how it will affect my future and i think i am having trouble discovering who i am and what i want to achieve. I’ve read your discussions and you guys just seem very wise and intelligent so i thought i would ask you

Thank you