Forgiveness

I've had a really good day so far.
My visiting teachers took me out for breakfast and it was so yummy. We went to the Star Cafe...my first time there but I remembered that my dad used to go there with  his work buddies after work.
I have been thinking a lot about forgiveness today. Not so much forgiving others...but of forgiving ourselves.
I have never struggled much to forgive others...instead I find ways to make the problem mine instead of theirs. I often thought "If I just hadn't been there, it wouldn't of happened to me", or "If I hadn't of been drinking...."If I hadn't of bought the alcohol...", just silly ways to make the problem my own.
My therapist told me that I need to find a way to forgive myself.
So today every time something negative has come up in my mind I immediately think to myself "forgive yourself, forgive yourself". It HAS kept Me from getting too down on myself today.
What are ways that you have found to forgive yourself??? Is the trick as simple as positive thinking?