I've come to that age when I start to blame myself for daring to dream. Some kind of wisdom inside is telling me to not give up too early. That I will regret it whole heartedly when I mature even more and come to the realization that to at least try to reach for your dream is the only way to truly live.
Intelectual knowledge is however not the same as knowing and feeling from experience.

Was it in a cheesy tv-series, in a book or a movie where they sad the quote that made me see my reasoning in a new light? "I don't fight to win, I fight to survive".

No matter how hard it is, how impossible it seems, I'm not dreaming only of success, i have made a choice of who I am. In my attempt to grasp something deeper and more meaningful I've found my passion. Isn't that in itself a treasure to guard with my life?

It's sound to question yourself but to doubt yourself is destructive. I don't know where on the scale question your questioning is but I do know that I have to ask in order to get answers. Yet again I do not ask to get answers always, I ask questions to see different possibilities. There is no pure truth or pure untruth. There are question without answers, but all questions forces you to think.
Maybe even makes you find answers to questions you didn't think of asking.