"I am good at teaching but in the form of one on one lesson or private tutorial form." How should I summarize it to be able to write in bullet form? (For enrollment form purposes) 用 英語 (美國) 要怎麼說？

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In my resume or profile, I wrote that I taught the Japanese language in some universities before, so they might question me that "How come you were able to teach in a university and yet you say that you are not good at teaching many people?"... My reason is simply that, I was not really trained or even studied on how to teach. In fact, I don't have a degree. I was only commanded by the CEO of my previous company to teach Japanese since we have no other employee who could speak the Japanese language and it would be a shame for us if we decline the request of our partner company, which are the universities that I taught... But this is too long, I hope no one will question me, or else I will go nuts XD