When you pray, think of things you want to say to God. Jesus was asked by his disciples how they should pray, and He said "When you pray, say: Father, hallowed be your name, your kingdom come. Give us each day our daily bread. Forgive us our sins, for we also forgive everyone who sins against us, And lead us not into temptation." Luke 11:2
This outlines parts of prayer, and our prayers should include these main points: Add more If you like.
If you use these points in talking to God, you should find peace and feel better. Pray with a selfless attitude, not an "I want" attitude. Ask for your needs, and don't be selfish.