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[Patrick]

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We are One.  There is no difference between not forgiving self, and not forgiving another.  The idea takes getting used to, but a huge, broader spiritual lesson is that we have no more excuse to treat ourselves badly than we do to treat others badly.  

Again, from the point of view of STO, there is no distinction between how we treat self vs. another-self.  Harming is harming.  Blaming is blaming.  Emotional abuse is emotional abuse.  Loving-kindness is loving-kindness.  We sometimes feel that we have a carte blanche to beat up the part of the Creator that has been entrusted into our special care (our self), but that is not so.  All is One.
...

That is why self-sacrifice (the giving up of one's own interests or wishes in order to help others or to advance a cause.), if done to your own detriment, is an unbalanced action.  It is compassionate and positively polarizing, but the helping of the One in other-selves while sacrificing the One in your-self results in no real gain to the One.

So like Stranger said, it is the same with forgiveness.