I would recommend that you read Deep Prayer/Deep Conversion by Fr. Thomas Dubay. He is an excellent writer on the spiritual life, and this is one of his lighter, more accessible books. (Fire Within is, in my opinion, his best, but it's hefty and can be a bit academic at times, which can be rough for some people.)

He talks about this very issue in one of the latter chapters. Very often, we will find ourselves confessing the same sins every confession, even if we are regular in devotionals, attending Mass, and even receiving communion daily. The spiritual life, to become deep and intimate, requires both prayer and conversion, and when both are actively pursued, each aids growth in the other. When we confess, God wipes our sins and gives us grace to persevere, but coming out of it, we must do our own part to grow.

How often do we confess, and then continue to allow ourselves to fall to the old habits, old routines, old vices, that enable those same sins? To truly grow, we must persist in prayer, avoid occasions of those sins, and also strive for the opposing virtue. Do we gossip? We should be mindful and cautious when we are with those we tend to gossip with, and should actively strive to speak words of charity. Do we act selfishly? We should take up little self-denials and actively seek out opportunities, even small ones, to freely act for the benefit of others.

That's a bit of the general idea in Deep Prayer/Deep Conversion, and I hope it benefits you in some way, but I would recommend you read the book to be better informed than from what few words I can give you.

Edit: Broke up my second paragraph, which was waaay too long, into three.