The sudden disappointment of a hope leaves a scar which the ultimate fulfillment of that hope never entirely removes. No matter what the disappointment is one must move on and be stronger than before.
You can ask someone older than you for directions, because the wise have lived through it and may have answers. Never fester in it too long because that can get toxic. It turns into resentment and even more disappointment. Things that fester have a decaying odor, and bad feelings can have a decaying effect on friendships and the heart. Letting bitter emotions fester often leads to their getting worse.