We shouldn't in any way allow our lifes to be controlled by our own limited beliefs no matter what.

I wouldn't agree less but I must say, belief is a strong conviction someone has. When u belief in something it's very hard for you to turn your back from it. Imagine someone trying to change your beliefs in Jesus Christ, do you think that will be possible?? Let's look at those suicide bombers, it's their beliefs that makes them do such.
Like you said in your post

They maybe uncounted limitations that have been put in us from a young age through out our entire life.

Changing something someone has believed in OR heard his entire life wouldn't be easy and it's either it ruins your life our make you made.

Our lives gets to change the very instant we decide to change our mindset and the way we approach life challenge.

To me I believe our mindset are mostly set on the way we see things while growing up. Some people grew up seeing failures as a normal thing and before they even try they conclude they have failed. May God help us have the right mindset and courage to move on.