We all mistakes, and in some cases, you will have an opportunity to go back and fix the mistakes that you've made, and learn from them as well.
But living in Canada has taught me three things that you should absolutely NEVER make a mistake with because it will haunt you for the rest of your life.
1. Do EVERYTHING IN YOU POWER to avoid EVER getting involved with the police and having a criminal record. The system might be designed for reform, but most people, employers, and society doesnt seem to recognize this. Once a criminal, always a criminal it seems to be.
2. Your drivers licence is a privilidge and can be taken away. After 12 years of driving from the time i was 16 years old, i can atest to the fact that it feels really crappy to have your licence revoked for 2 years, plus having to get involved with the police, the court systems, and not to mention the unnecessary waste of money you shell out in lawyers and fines that could easily amount to the down payment on what would be my first home. When you're young this may be hard to understand and i'd really hate for you to have to learn the way i did.
3. Travel! There's nothing in this world that is better at teaching you about diversity, human suffering, poverty, world issues etc than seeing it with your own eyes first hand.