When do all our dreams die?

Oh God, when I was little I had so many dreams, I thought everything was possible until the reality hit me. And that reality was growing up. 
 I guess our dreams die when we decide we won't make the sacrifices that it takes to get to the peak. When we let our fears rule our life, fear of what other people think, fear of the unknown, fear to speak our minds.  But isn't the unknown what makes us grow and learn, isn't that what makes the journey all worthed? We are too afraid of change, but life changes wheather you want that or not, it's part of the world. A tree grows and becomes bigger as times passes, and eventually dies, but did that tree, during his life left any seeds behind? Today dies tonight. Did today left something worth mentioned for you? I hope you did something to make the world a better place, or something that makes your life better, we are all superheroes, at a bigger or smaller scale, but we are all someone's superhero,or at least we fool ourselves to have something that keeps us going. 
So returning to the main topic, we find excuses not to make ourselves happy, we blame others for our mistakes, most of the times, when we really shouldn't care what others think, or if we fall, we shouldn't think about it for a whole day unless the injuries are serious.