Our sins aren't the biggest problem, as long as we repent of them, resolve to change, and grow in humility.

Fr. Joseph Tissot, How to Profit From Your Faults (Amazon link; however, it looks like it is not currently available. Perhaps try your friendly neighbourhood Catholic book store)

St. Augustine states “God prefers to look at bad actions accompanied by humility than at godly works infected with pride.”
St Optatus of Mileve, "Sins accompanied with humility are worth more than innocence with pride."
St Gregory of Nyssa, “A cartload of good works drawn by pride leads to Hell, whereas a cartload of sins drawn by humility leads to Paradise.”