You should realize these things by the age of 21

Train yourself to do nothing on your own to avoid 99% of mental issues.
The things that kill success the most are sex and pleasure. It will stop your brain from growing and kill it.
Don’t listen to advice from people who aren’t where you want to be.
No one will come to help you out of your problems. It’s all up to you to take care of your life.
If you find someone better than you, don’t try to beat them. Instead, work with them.
Weed doesn’t help you in any way. Blunt will only slow down your thoughts and make it harder to concentrate.
Comfort is the worst kind of drug and the cheapest way to get down.
Don’t tell people more about yourself than they need to know.
Avoid drinking at all costs. Losing your mind and acting like a fool is the worst thing that can happen.
Don’t settle for something just because it’s there. Keep your standards high.
Your own family is more important than the one you were born into.
Your 9-to-5 job is someone else’s idle income. Find new ways to make money and set up your own stream of income.