A private life is a happy life. Never overshare your personal life with others hoping that they will understand you. They will only cause chaos, steal your joy and leave you battered. Be selective in who you let in and be fiercely protective of what isn't meant for others to know
When you're 27, life will hit you hard.
You'll understand the saying "money doesn't grow on trees." You'll work, pay for the house and bills, then work again. Repeat.
You'll miss your younger self, with fewer responsibilities and not knowing much about the world.