evidence dies hard

Hi! Doing the work diligently but the core belief is always just out of reach. My mind continually brings up specific evidence of how I have blown it, not followed through, gotten off track, spent time on the wrong things, etc, in the past. Intellectually I know I am capable but my inner critic doesn’t buy it and has lots and lots of specific proof. I don’t FEEL like I can either. I feel like I will let myself down again. How do I shift? Thanks!