I think that maybe what she could have meant was that moods are susceptible to changes and emotions but you have control over how you choose to respond to those moods and what you do with them. That's where therapy can help - to teach you how to manage your moods so that they don't control you. I would find encouragement in her response actually. I don't find that I have much control over how I feel at any given time so if my feelings were keeping me stuck, I'd feel hopeless. The fact that the thing keeping me stuck is how I know to behave based on those feelings gives me hope because I have the ability to learn to strategies.