The absolution of sin is a critical and regular step that every Christian needs to follow. To bottle up your guilt and blame, is unhealthy and will lead you to be unhappy. To receive a pardon from God, you must determine the things that you feel guilty about and confess them during forvigeness prayers. You are not praying to ask for justification or vindication for your crimes, you are asking that your soul be purged. Whatever revenge you have taken against your enemies, or wrongdoings you have committed towards your friends, you must ask for God's glorious mercy.
If you haven't had much experience in specific prayers for forgiveness, you may want to consult a support group. Some of the best Christian support groups are online and very welcoming of new members. My best recommendation is to seek support from the Christian Prayer Center. In terms of prayer requests, this online Church is excellent. They are a self supported site that vows to help everyone with their life troubles, and wishes.
To receive information about protection prayers, go to this protection prayer info site.
Remember to articulate your problems in your prayer request. God sees all, but he likes to hear your prayers shine through so he can show you leniency and grace in Heaven.