What you think you become.
We are a story in the making; a product of our own belief-sets. Everyone carries some of the collective experience as a baseline life-hypothesis and adds the personal perspective, and idiosyncratic lessons learned: we carry mental memes around such as, "my family supports me"; "my boss is challenging"; or, "I am overweight", or "I am good at my work". And as the years go by, dependent on how successful and how devoted we are in certain areas of our lives, we are willing to revise the narrative a bit. So we celebrate little success stories such as, "I always was pretty shy, but now I find it easier dealing with people", and will revise our belief-sets accordingly.
If you are willing to step back a little, you could question whether all limits are self-imposed. Someone with years of practice at work may have evolved from being in the "also run category" to mastery, which is a nice accomplishment; someone else might have gotten fired and needs time to rebuild this professional confidence. I salute the Law of Attraction folks for being open to experimenting with the thought and belief matrix that we all seem to operate within. "The Secret" is a philosophy of sorts. There is only one way to find out whether it works for you personally, you just have to try it!
It takes years to build the story one truly believes in. As we change our belief-sets, the world we operate in changes with us, but this adjustment is a process and requires time and patience. The boss who was once perceived as challenging may change his attitude towards us, or may be replaced by someone who has more of an interest in what we are doing. Or we might be changing professions ourselves. It takes time to adjust the characters in our movie for the reason that it takes a lot of time and persistence to change subconscious belief-set.
We spiritual travelers are different from the Law of Attraction folks in that we believe in the GUIDANCE of a higher authority. We also believe that there is a purpose to our life that gets communicated to us - a mission of sorts. GOD is writing the story with us, so to speak. Just as Lord Krishna reminds Arjun that each of us has some dharma to live through:
"It is better to do your own duty badly, than to perfectly do another’s; you are safe from harm when you do what you should be doing." (Bhagavad Gita)
Interact with life and grasp this passion and purpose that life has in store just for you and do it to the best of your abilities. Your feelings, your intuition, your insights and the signs of the WAY will lead you to your life story. When you truly believe in your mission, your subconscious belief-sets and life's events will follow you. Yes, you are that powerful! Once you have discovered purpose and passion, follow it with all you got. Make your story a good one and share it with the rest of us.