We all doubt about existence of God at some point of time. We doubt whether our prayers reach to him. I believe in God and I feel in crores of prayers reaching out for God, they will someday reach him.
Prayers are a former of hope, a hope that maybe one day, God will listen, that God is with us, he will punish when we make mistakes and guide us through.
So when u pray, let your heart out, confess to God. It will make your mind lighter and you give you strength and hope to mobe forward inspite of everything. Pray everyday