In order to be forgiven of your sins by the Lord, you have to forgive others even if you don’t want to. It is the only way that you can receive forgiveness.
When you pray be sure to forgive others you are angry or upset with so that your Father in heaven will forgive you
If you are not judgmental of other folks then God will not be judgmental of you. If you do not condemn others then God will not condemn you, and if you are forgiving of those you feel have harmed you in some way then God will also forgive you in the same way.