I've always been a believer in "fake it until you make it." The whole philosophy gets a bad rap... but it works. Achieving something requires more than just action, but it's a great place to start. Our behavior has incredible influence over out attitude and our emotions. Most of us (women especially) usually go the other way around. We wait around for our thoughts to be the motivation we seek, but more often than not, our behavior is much more important. I must warn you... this is not permission to be something or someone you are not. Nor is it encouragement to be inauthentic. On the contrary. This mindset is only to be used when striving for a goal, modifying a behavior or changing an attitude.
Start "doing" and the rest will following along.