I would not call it selfish. I see it more as a symptom of our times. We are deadly afraid of failure. As long as you tell no one, there is no one to disappoint. There is no one that can point a finger and say, "I knew you could not keep this up".

You shared it here, and I would recommend sharing it with at least one person in your life with whom you feel comfortable. Someone who will support you and not judge you. Congrats on what you have already achieved and all the best on the rest of your journey.