There is argument I've heard that God doesn't hear your prayers when you have sinned and have not repented, especially mortal sins/grave sins. I don't agree with that, but I could be wrong. Sometimes when I feel like I'm hopeless because I'm a sinner and so far from perfect, I still pray, and I've still been shown and given signs and Graces that are obviously His work. I'm so thankful that He reminds me of His love that it makes me want to work even harder to grow closer to Him.
St. Teresa of Avila, pray for us.
St. Francis of Assisi, pray for us.
St. Dymphna, pray for us.
St. Anne, pray for us.
Our Lady of Fatima, Lourdes and of Good Counsel, pray for us.
All saints and angels in Heaven, pray for us.
Lord, please hear our prayers, and forgive us our sins.