First, let us realize that when we forgive other people who have hurt us, we are exercising the moral virtue of love. We are loving that person, as best we can, not because of what was done, but in spite of that. Try forgiving others first, even if the hurt you experienced is not strong. I want you to get used to offering love to those who have been unfair.
Once you have done that, then consider practicing loving yourself, not because of what you have done, but in spite of that. This does not “let you off the hook,” as they say. If your actions have offended others and not just yourself, then go to those others and ask for forgiveness; make amends. You might begin to find that you can now forgive yourself by unconditionally loving yourself as you have learned to love others.