Have you set yourself a goal and told everyone to keep you accountable? Got a plan to make it there so that you stay focussed?
Have you listed all of the amazing things about you that mean you’ll make it?
Yes, your goal might mean trying new things or pushing yourself to new limits, but you’ve a stack of great qualities which are already there. Let go of your modesty and imposter-syndrome for a while and allow your ego to shine!