I have committed such great sins. Will God forgive me now?

The Bible says, “If we confess our sins, He [God] is faithful and righteous to forgive us the sins, and to cleanse us from all unrighteousness.”
1 John 1:9

When we confess our sins to God; God will forgive those sins and allow us to have friendship with Him.

It is not necessary to confess your sins to any man nor priest for forgiveness of sins. You don’t need a go-between to reach the ears of God. As mentioned before, there is only one mediator between God and man, and that is Jesus Christ.