Too often we set ourselves back from reaching our true potential out of fear or insecurity. Don't hold yourself back because you're afraid you may not be good enough or won't be able to hold your own. This kind of thinking only prevents you from experiencing and achieving the great accomplishments you're capable of.
If you harbor this kind of self-induced fear, really examine what's at the center of it. Often times you'll find that once you confront what the true cause of these fears is you'll be better equipped to battle them in your effort to grow and learn about both yourself as well as the world around you.