still I think I can't understand the pain of people from that timeline

Yes! Personally, I find it difficult to identify with the history of Bulgaria, and to be honest, I don't understand those young people who tattoo famous national heroes from the past on their bodies. Not only because the history in textbooks is not always correct. In my opinion, what is taught in school is again a political game that serves the government at the moment. Not to mention that two opposing versions of the same story are written in the history textbooks of two warring countries. 😅 In short, nothing is clear.

Why can't there be peace in the world...

I think that it has only recently become clear to every ordinary person anywhere on the globe that peace has never been a goal or an aspiration. For financial and political reasons. And that is why wars will never stop, even now we are threatened with another world war. Enmities between neighbors are no longer enough. One can even wonder how we managed to last so long without a world war.

Then it's not Bulgarian, right?

For political reasons, many political figures, scientists and researchers claim that the Macedonian language is a form of the Bulgarian language. Today I read that years ago there were parties that even proposed to fine TV stations when they put subtitles on the Macedonian speech. This was not right according to them, because it is the Bulgarian language.
They may be from the same group and have a common origin, but the fact is that I do not understand this language and I feel harmed when I watch a report on national television without subtitles.
Consider how far political propaganda goes. It seems unbelievable nowadays. Even funny in some ways. But mostly sad.😔