You have the virtue of asking the question and answering yourself correctly. Disappointment is a hard blow to the spirit. It's hard to get over immediately. The good thing is that you respond to the tests that life gives you, fast. Your poem sums up well the emotion you wanted to share and, you hit the target, when you discovered that the ego is the maximum force of disappointment, which weakens it.
The phrase that precedes the poem seems inspiring and good companion for you at this time:

Life is about flexibility, being able to go with the flow and knowing that whatever happens, you will arrive where you are supposed to go.