Learn From Your Experiences: The older you get, the more you realize how much you can actually deal with, especially when you make it through the other side. You're able to look back and realize what you've learned and why things happen the way they do. In the end, everything eventually works out exactly the way it's supposed to work out. Every bad experience is also a moment of learning AND opportunity.
Knowledge is Power: The more you can learn about yourself and why you make the decisions you do, the more comfortable you get with yourself. Two fantastic books to read to help with this are: