Hello @chichi76!
You may also feel insecure because you would have done tried something in the past but failed at it. So, ultimately you gain a fear that nothing that you do is ever good enough. The only person that has the power to change anything about you is yourself. If you can work on your insecurity and be a better version of yourself, you do not need to feel insecure if you are working on yourself continually.
Thanks for sharing and good luck on the contest.