In your relationships with one another, have the same mindset as Christ Jesus.
~ Philippians 2:5
The bulk of the old testament is an attempt to teach us how to be on good terms with God and love Him. While a majority of the new testament is dedicated to teaching us how to be on good terms with others and love them as Christ loves them.
Life is far to valuable to waste on anger or grudges held against someone you care about. There is nothing "Christ-like" in living at odds with people.
Perhaps today is the day you restore a few broken relationships. Make the moment about them instead of you.
Start by making a list of those people on your "grudge list". Pray for them every day for a week. Then reach out and work toward restoration or closure - God will lead the way.