I believe that a trusting attitude and a patient attitude go hand in hand. You see, when you let go and learn to trust God, it releases joy in your life. And when you trust God, you're able to be more patient. Patience is not just about waiting for something... it's about how you wait, or your attitude while waiting.
It's easy to get negative because you get beat down. You go through a few disappointments and it's easy to stay in that negative frame of mind. Choosing to be positive and having a grateful attitude is a whole cliche, but your attitude is going to determine how you're going to live your life.