Don’t think that you’ve been gone too long to come to Him. God is not some spiritual parole officer waiting for you to fail. If you’ve strayed from prayer, He is not keeping some score. If you don’t feel Him at all, tell Him that: “I don’t feel you right now, God.” Pray with any amount of faith that you have; believe that prayer works; ask for faith if you have none. If you’re mad, tell Him. If you’re ashamed, guilty, confused, afraid, doubtful: tell Him. He can handle that. He is understanding, patient, gracious; He loves you. You’ll soon find you’ll want to talk to Him, because He’s actually pretty awesome to talk to.
— from this post, about prayer