Forgot My Parents' Anniversary

Hey guys, so I made a huge blunder this week. I completely forgot my parents’ anniversary! They’re always sending me care packages and calling to check on me at college, but I was too busy stressing over midterms and part-time work. Last night, after they called, I realized the date on their wedding photo framed in my dorm room. Now I feel like such a terrible child for not remembering something that important to them. How do I even begin to apologize? 🙈