First quality: you are capable of great things, but you must never forget that there is a hand guiding your steps. We call that hand God, and He always guides us according to His will.
But time, as well as healing all wounds, taught me something strange too: that it's possible to love more than one person in a lifetime. I remarried. I'm very happy with my new wife, and I can't imagine living without her. This, however, doesn't mean that I have to renounce all my past experiences, as long as I'm careful not to compare my two lives. You can't measure love the way you can the length of a road or the height of a building.
Now go back and meet all those people who you think know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.