I am sorry

Sometimes when you are not knowledgable about another person's culture and customs, especially if you are from another country, you can unintentionally make mistakes that offend people. You are unaware of what you are doing and they become upset. Therefore, I apologize to everyone who gets angry or who becomes upset because of my mistakes, which I am unaware of.

Note: there are at least two “mistakes” that I’m using because it’s how people talk. I ended a sentence with a preposition (“of”) and I also used “they” rather than “he” or “she” for a person.