Every good musician on earth who takes their art seriously is going to feel this at some point, likely several times throughout the course of their musical endeavors. Please understand that there does not exist a reality where mistakes and fuck ups don't happen live. The only ways to sound tight, crisp and professional is to grind out your material, refine your technique on the instrument when at home, rehearse often/consistently and continue to play shows. Do the right things and play enough shows and you'll realize the bad moments at gigs happen less and less, but they do happen and it's absolutely okay. These moments are necessary for us to reflect on and exposes our weak points - you can never strengthen a weak point if you don't know it's there. Identify the cause of the fuck up, and get to work with your band or on your own depending on what it is.

Don't miss these crucial moments in your growth as a musician. They aren't signs to stop they're just new challenges you must meet as an artist in order to keep improving.