It is known that even when you were in your mothers womb your parents were having an influence on you. This was stated by Bruce Lipton in Biology of the Mind - a very interesting book/tape if you want to learn more about the scientific way of thinking with regard to the way the Universe works.

The attitude of your mother and father to your pregnancy could have had a lasting effect on your life especially if it was a negative feeling. This means that when you are dealing with old patterns of  behaviour and recognizing thoughts in your head, it could be as deep rooted as when you were in the womb. 

So when letting go of your difficulties and things holding you back, be aware that it is not only the things you can remember but also things that just happened. Know that whatever it may be and whoever is behind the influence of it, that forgiveness is the key to letting it go and letting your life truly flow.