This is really a fun skill to learn that you have. I've had a pretty good ear for relative pitch since birth, which my music teachers picked up on right away (I could play songs "by ear" after hearing them a couple of times), but I struggled with blind pitch in the mornings... until I realized that, for whatever reason, I can hear the theme from Zora's Domain in perfect clarity in the proper key.

I used that to fake absolute pitch for a while in college, then explained to my voice coach what I was doing, and he looked at me like I had three heads. I'll never forget it. :)