If Jesus Christ was who He claimed to be, and He did die on a cross at a point of time in history, then, for all history past and all history future it is relevant because that is the very focal point for forgiveness and redemption. ↗
Forgiveness is not a feeling - it's a decision we make because we want to do what's right before God. It's a quality decision that won't be easy and it may take time to get through the process, depending on the severity of the offense. ↗
When I was a kid I used to pray every night for a new bicycle. Then I realised that the Lord doesn't work that way so I stole one and asked Him to forgive me. ↗