There is nothing more important in the world than yourself.
People come and go. One second they are there, the next they are gone. You don't have anyone forever. Well, you have one person, and that person is yourself.
You only get one life. One chance to make everything right. One life to enjoy. To laugh as much as possible. To smile so much by the time your fifty your face has deep lines set in around your mouth.
How can you enjoy life if you don't enjoy yourself?
Don't worry if that boy hasn't texted you back. Or if your favorite pair of jeans doesn't fit you anymore. Don't worry about being too loud in case you annoy someone, because at the end of the day, they don't matter.
You do.
Your mind is the only thing that can make you hate life. So instead of caring so much, let it all go, because nobody else is as important as you are.