What sort of advice would you give your younger self?
2. Nurture friendships. That best friend you have at 21? She'll be a bridesmaid at your wedding. You'll be Godmother to her daughter. She'll be Godmother to your son. She knows you, inside and out. She gets you. But good friendships only last because both sides work at them. Otherwise that person simply becomes someone you used to know.
3. If you want to leave your job/change career, you can. I know that seems a silly statement given that you are only just starting out on your career path and you love what you do. But things change, and it won't always be the case. It's okay to take control and say one day, "I want more than this", even if you don't know what that more actually is. You may never decide what that more is, but no matter, because you'll always be employed in jobs and places you enjoy. Mostly. IBM notwithstanding.
4. Keep driving. It's something that you take for granted. Something you don't spend much time thinking about. You're a good driver and driving gives you independence. You won't believe that once into your 40s, you'll drive less and less. Be brave and keep being the one in the driving seat. You won't regret it.
Similar posts include this one by Jaime at angloyankophile and this one at A Cup of Jo.