Take lots and lots and lots of chances. Because that's how you learn. That's how you grow and that's the only way to really live. Every amazing situation I ever came across in my life all came through moments of unexpected courage where I did something I wasn't exactly 100% comfortable with. And more than likely, something really worth it comes from these experiences. When you encounter an unfamiliar situation, how you react to it makes you.
Follow your dreams even if it's scary, go talk to that boy even though you're intimidated, climb that rock even if it's big, say no because you don't want to do it, say yes because why miss out on great experiences? It's all about taking chances. No matter what your situation is. Be courageous cause you'll be a lot more happier in the long run. The fear, the scariness of it all.. it's ALL in you head. You are stronger than you believe and you have way more capabilities that you can possibly imagine. The only way to know is to take this chances!