You know how they make snake antivenom? The venom is diluted and injected into horses, goats etc until their immune response produces appropriate antibodies. These are extracted from the blood.
It's probably the same thing with you. Get stung often? Doing the same to a person regularly does not appear to keep sufficient antibodies in the blood to effectively handle an actual snakebite, but probably enough for bees.
__________________
| (• ◡•)| (❍ᴥ❍ʋ)
|