u/BAT1KAN

First of all I (22M) have never done this in my life and this is the first time this happened. I live in abroad right now and my parents are in my home country. I totally forgot that today is her birthday and she called me and told me it was. Because I have the best mom in the world she was like "I don't care if you forgot it, as long as you are healthy that's the best gift for me". But still I cannot forgive myself. I started crying after the call. I feel horrible. I feel disgusted. How can I forget something like this?