TIFU by accepting Hero treatment as a blood donor of relatively rate blood group, only to find out my blood group was actually different

Obligatory this didn't happen today, but back during my college years.

Back in college, there was a blood donation drive on campus. I donated for the first time, and on my way out they told me I was A+.

A few months later a close friend's aunt was in critical condition and needed A+ blood. I volunteered immediately. When I got to the hospital, I was treated like royalty. The family was in tears, thanking me, practically force feeding me food while we waited.

The nurse drew my blood and told me to wait while they confirmed the match. I sat there soaking up the royal treatment, everyone fussing over me like I was some kind of hero.

About an hour later, the nurse came back looking thoroughly confused and said, "Wait. Did you not know your blood type? You're B+."

I have never wanted to disappear from a room faster. Probably the most embarrassing moment of my life 😭

TL;DR: A college blood drive volunteer told me my blood type was A+. Months later, I accepted royal treatment and free food from a friend's crying family as a "crisis donor," only for the nurse to reveal I am actually B+.