What is the purpose of prayer?

For me personally prayer has never worked. When I was being sexually abused I turned to God in prayer and I was never helped. I personally never experienced anything good come out of praying or asking for help. I honestly have given up at this point. I used to fall asleep praying all night. I just haven’t been helped by it. It hasn’t made me feel better in anyway. I definitely don’t feel listened to or heard.