You're CMV negative. That is not common and your blood is exta valuable.
I'm CMV negative also, and I donated for years. Then I got a false positive for Hepatitis B (which I've never had) and they won't let me donate any more. Dumb.
The only time I had a bad reaction was when I had to sprint for a train right after donating. I almost passed out. I spent the train ride with my head between my knees. Oh, that was awful.