The only limits of tomorrow are the doubts of today

That's right.
There's another saying that goes with the title:
' Do not underestimate the power you have over today;
  Do not underestimate the power today has over tomorrow.'
You plant the seeds of the future in the present, and what other present like now? :)
Everything you do, every choice you make in the present, affects what's going to happen next. That's probably why time travel is impossible. The future is constantly changing. But it's all up to you! No pressure, yeah?
:)
So know that YOU (yes, you) have the ability to change your life.
With one simple choice.
Get rid of you fears, for the key to change is to have no fear.
Change.
And see magic unfold.