#1 Good friends are easy to find.
Some of your best friendships will be formed in your college or school life. Once you become a so called grown up, you would not have enough time for your friends. You wont be willing to invest much in the relation of friendship. That's why it becomes very difficult to form lifelong friendships in your 20's.
#2 Everyone has to like you.
Inevitably, someone will always dislike you. Nobody cares about you except your family or some close friends. The sooner you realize this the better your life will be. Don't have a fear of how people will be judging you. People are so busy in their lives that they do not have enough time to think about you. Just follow your heart and do not care much about people.
#3 Being in a happy relationship means that you will never again feel____(insert depressed, lonely, scared, insecure, etc).
A happy, loving relationship is one life's greatest joys, but it can't solve the things you don't like about yourself. You have to do that, with work.
#4 Being good at school means you'll be good at work.
Being a great student does not mean you'll be great in the workplace. Everyone fails. Keep trying. And that's OK.
#5 Having a good job will solve all your money problems.
Getting a job is just the beginning of your race to earn more and more. Your expenses keep on increasing with your income and you will never be satisfied with whatever you get.
#6 It is easy to follow your dreams.
College is the best time to discover your passions and follow them. Once you get into a full time job you tend to become lazy and start procrastinating a lot. You wont be willing to step out of your comfort zone and take risks in life. Once you get married it would be even more difficult to follow your dreams.
#7 Physical fitness doesn't matter, being thin matters.
Being skinny does not matter. Being physically fit really, really matters. Eat lots of healthful food and get tons of exercise.
#8 Material things matter more than Experiences.
You will be never satisfied by how much ever money you earn. There will always be space for more. You should not invest a lot in materialistic things. Instead start investing in experiences. Travel the world and meet people of different cultures. This will open your mind to a lot of different perspectives and will give you much more satisfaction than money.
#9 Getting rejected is the worst thing that can happen.
It really isn't. In fact, it can be a really good thing. When rejection teaches you something new and positive, then that's actually a pretty great thing.
#10 Talking is more powerful than listening.
It's amazing how so many people feel the need to fill the void and cannot just sit quietly with you and speak only when moved to do so. It's a lost art!