It is true that there are certain things that I don't like about my culture, but it doesn't at all means that I am a blind fan of the West's mad freedom.

Good to know. :)

How would you feel when the people around you have no understanding of things like that.

I would feel the same way you do feel about it. I think this is a very common experience between people all over the world. But then I like to ask you: If all people within your reach exactly understood you, never gave you the impression of you being a fool or wanting to show off (which you were, are and have done for sure once in a while, like every one else:), where would you get the chance to mature? These people, who annoy us, who seem not to understand, who speak not "our" language, aren't they the ones who teach us most?
They give us the chance to realize where it's futile to "make them understand", to let go of this desire and where it can be a needed challenge in trying to be understood.

Among many people in my life, I love talking to my youngest brother. We have conversation over ongoing events. He understands what I say and has something to contribute to my understanding.

I have four brothers and one sister. It's one brother I have a very intimate relationship with. Similar like you and your youngest brother. So there is a ratio that is five to one. LOL. I think, it's somehow normality to not get along in the exact way one desires and needs it but more in the way of struggle, negotiation, often trouble and the opposite "boredom," during daily routine.
Welcoming the challenges from people one knows seems to be more difficult than doing the same with strangers. It's easier to talk to you and challenge you than doing it with my sister ;)

I simply crave for intellect and intellectual people in my life. People who have some wisdom to share.

Yes. I very well can relate to this. Nothing wrong with it:)

I start feeling irritated of useless and aimless kind of subject matters that are the part of the conversations in m surrounding.

While I do share these exact emotions, I allow myself to answer in this way:
It is not the problem of those in whose company you get these very feelings. They cannot be held responsible for it. If simple and small talk is there preference and no attempt whatsoever from your side made them change their habit, it is you who can learn to take joy in small and simple talk and become contend in giving yourself this experience. Or, to learn to withdraw earlier without annoyance but looking forward what you enjoy to do.

I would say that everyday life appears to be dominated by aimless and useless seeming talks and tasks. But they are in the same way a reality like the background of a painting scene that does not live without the foreground.

I split the rest of the answer and make a second comment.