Knowing things

Many times I have had to hear this: "Hey you still dont know this?"...

This has instilled fear in me...and I now think whenever relevant circumstances arrive - "Oh! I think I should have known this by now, but due to my dumbness I dont. Now lets pretend that I know this." And then this pretension often fails. And they come to know that I dont know, and I feel really bad and stupid. Then I never come to know that thing in good detail, and even for other things, when my pretension succeeds, I never end up learning much about that thing.

[This fear has "action" harms - just to prove that I am not dumb (ya again) I try to find things on my own, like Internet or reading manuals, and then show the others that I have found this - I have found that. That I am normal. This is sometimes taken as rude, since I try to prove that I am smart, which is liked by nobody in general.]

The right approach seems to be: "Oh sorry I dont know. I am good and normal enough to have known it, but I just didnt happen to be in the circumstances that I will come to know this thing. Please can you tell me this thing? See understand that by my proactive approach of asking such things, I usually end up knowing many things that are needed to be known by people of our age and circumstances, and thus I am a capable person. Over time, you will come to know from me some other things which you wont know. Thus I am valuable, and we are all similar people, I am one of them. Please tell me".

This approach usually ends up better, because the other people explains about that thing, and you come to know it in detail. (And thus how memes are preserved and conveyed in groups)