Great word from Tim Keller on prayer and the Gospel:
One of the most basic things that the gospel does is change prayer from mere petition to fellowship and the praise of his glory. Galatians 4:6-7 teaches us that when we believe the gospel, we not only become God’s children legally, but we receive the Spirit in order to experience our sonship. The Spirit leads us to call out passionately to God as our tender and loving Father. The Spirit calls out ‘Abba’ (4:7). In the very next verse Paul refers to this experience as “knowing God” (4:8). We do not just know and believe that God is holy and loving, but we actually experience contact with his holiness and his love in personal communion with him.
I don’t know if your prayer life reflects this reality or not, but may you look to the Gospel again and find that God loves you in spite of who you are. Run to Him as your Father.