George Bernard Shaw once wrote these words: "People are always blaming their circumstances for what they are. I don't believe in circumstances. The people who get on in this world are the people who get up and look for the circumstances they want, and if they can't find them, make them."
Let me put this in another way. When you encounter a barrier which keeps you from the thing you want, it is there to see how much you really want to achieve your dream. If you want to get on the other side of the barrier badly enough, you will find a way over it, around it, or through it.
Marcus Aurelius said, "Nothing can resist a will which will stake even existence for its fulfillment."