The two words, "be yourself" has a lot of meaning to me recently because I am at a point in my life of self discovery. No I am not quitting my day job, or backpacking up some mountains or even fasting. I am just making a ton of mistakes and learning from each of them. I think I have championed as many failures as I have celebrated my successes.
The best advice I would give anyone sailing on the same boat of life, would be to listen to the voice in you. The voice of self doubt but also the cheerleader that is trying to make you think positive...and not feel guilty when you are confident in yourself and the decisions you make in life. Each step forward is a step in the right direction...any step backwards is a break for you to reflect on what to do right the next time.
Life has a funny way of knocking you down when you least expect it, but also bringing you up to be able to smile and learn from the mistakes you made.