Do we know what we MUST know about ourselves?

I have in the recent past found it problematic that people cannot answer some basic questions about themselves! I will not indulge into this for matters of not breaking of ethical code of conduct, but I feel there's a potential area for research on whether we know we should be knowing about ourselves.
The list can be long, but I am finding a big problem on the following;

1. Blood type
2. Height
3. Weight
4. Waist size
5. Foot size
6. Eye color
7. Reaction to drugs
8. Disease history [at least some bit of it]

I have found out that this problem is widely pronounced in males than females. But such guys, they know all about English football - who plays for what, who manages where, who scored and how much everyone earns...they also know who owns what in Kampala, who goes out with who, who chucked who, who's pregnant, who has HIV, the list is long.
Can you guys know yourselves and then try venturing into something else? Before you crucify me, note that I talked about males because they suffer from this more than their female counterparts.