How come we live in a world that anwhere everything is unfair.?

It is hard to think about how it is possible that we havthere are people in this planet living their best life, underdue to the suffering of others.

Using "under" seemed a bit unclear - please correct me if "due to" is not the meaning you intended!

It is so painful to see good people, who are actingct kindly, living horrible experiences and lives.

I know we all have so many questions unanswerable questions and concerns about this life, and how or when this is going to end.

I do not pretendmean to be dramatic, but there is no way to express this with noout drama.

"I do not pretend to... , but... " is moreso used to say you may not be skilled/an expert at something, but you have an opinion anyway. For example: "I don't pretend to be an expert, but I think that.... xyz".
For your sentence, you could also say "I am not trying to be dramatic, but..."

Sometimes, it seems like the very universe rewards the evil.

Moreover, I still have faith that goodness and love is in all of us, d. Despite the amount, everyone has something.

You were technically correct, but I had to read your sentence twice to understand it - the correction was more for clarity.