A prayer for Inner Change? As well as the Outer Persona?

I am a Catholic, and am in need of some help. I need a Prayer that is truly of great help. I am one that sometimes becomes doubtful and with little faith at times. I do need help, and I know Prayer can help me release my past self, and inner stress. To be reborn and cleansed is what I most desire and look for, I know that God can help me, but I need the right Prayer to start it of. I do believe in God, but I know sometimes he may not let things happen the way you want them is because there is a deeper meaning hidden, and I guess that's what really makes my faith in him lessen because he might not answer my Prayer for he may think it best for me to suffer and see beyond what I know and understand. I have been praying now don't get me wrong, with all the good feelings I possess, with pion & with tears, a prayer of repetition "over and over again", yet nothing. I feel just well Depressed. I mean it's not much selfishness because a change that I ask for will help those whom come to me for help, now how can I help them without being able to help myself. I love the people whom surround me, they are my World, I just want him to answer my Prayer so that it isn't only I whom am helped and reborn, but those whom I love and cherish.