いきなりせんせいみたいなことをいったが、わたしはただのいっぱんじんです😅

about the characters with voiced sound marks and small characters, you don't need to be aware of it at first, you can read only the parts where you can read without them.
ex:いきなりせんせいみたいなことをいつたか、わたしはたたのいつはんしんてす
That's enough at first.

By the way, the meaning is as follows.
I suddenly said something like a language teacher, but I am just an ordinary person😅