He said to me, “My grace is sufficient for you, for my power is made perfect in weakness.” Therefore I will boast all the more gladly about my weaknesses, so that Christ’s power may rest on me. - 2 Corinthians 12:9
Paul faces down his false self (the good in himself that he's tempted to overemphasize to others) and his shadow self (the bad in himself that he's tempted to hide, deny and deride) only be doing the deeper work of allowing his true self to be embraced by God. That's the key. It's not just white-knuckling your way forward - it's an immersion in grace.
Paul truly, deeply believes he is beloved by God. Paul experienced grace and was marked by it - to such a degree that he could surrender his false self and expose his shadow self. Only people who are rooted and secure in divine love can make that move.
Today is your day. Will you allow yourself to be loved? Will you allow God's grace to be enough for you? Birth, life, teaching, death, resurrection, and ascension of Jesus wasn't just for the world - that was for YOU, so that YOU could know how loved you are. So that grace could be enough for you. Immerse yourself into that grace today!
You might start by a simple prayer: "God, it's hard for me to believe and experience that I am loved by you. Help me. Pour grace over me today, and help me to know it"