One can only provide absolution for another only if he/she themselves received absolution. In other words I cannot pray asking God to forgive you of your sin if I never confess and ask God to forgive me for my sins.
The Bible in James 5:16 says, "Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much."
1 John 1:9 also states, "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness."
We our self can pray and ask for forgiveness for the sins we have committed and be free from that guilt. We ask others to pray for us so we can received absolution but we have to be careful when they themselves might need prayer for sinful things they have done if they have not repented of their sins.
Find a closet, humble yourself on your knees and make your confession before God. He will free you from your guilt. I didn't say find a priest ;) ....I am joking.