Don't look up when he says hey for the very first time.

 I know you're dreaming about this singer all the time and guess what: in about 20 years you'll have the most incredible romance with him! Unfortunately it won't last. But hey, your dream came true.

 All those hardships that almost killed you, really don't mean all that much in the grand scheme of things. Forgive and Forget, it's the better option.

 I still have no idea what I want so don't worry.

 Put down the knife. Scars last longer than sadness.

 Forgive everyone for everything and ask nothing in return; bitterness is a disease that is not contagious, only you die from it.

 Use a rubber!

 Being good at math and science is not a bad thing and it can make you a lot of money. Those kids have mean words, but you will survive and prosper.