Good morning, Bibboo.
I may miss a lot of this one because I am not familiar with your culture.
There is an obvious feeling of being threatened. Since you truly do have an enemy so near this is not so unusual. But the dream threat can also signify many things.
Quite a bit of this dream seems like an epiphany - you don't pay much attention to the lesson in the beginning, but during the course of the dream you first feel a unity with others of the same beliefs, and finally emerge as a leader. This seems like a desired outcome.
The wall is the obstacle. It is both smaller and harder than you expect it to be. It is made of chalk - could the obstacle have something to do with school?
The difference in your performance is how you wield the tools provided. This seems to be the real message here - you have been given all the tools you need, now you must learn to use them correctly.
The reaction of the people shows another desire - you want the respect and approval of your family and peers.
So, the message seems to be this: In your current situation, you are bored and the problems seem too difficult. My guess is that this is a school situation. But you have realized that the time is soon coming when you will have to deal with life outside of school - this is the approaching enemy. You understand that you are indeed equal to the challenge - you have been given the tools, and you understand their proper use. You expect to acheive far beyond anyone's expectations of you.