If you don’t know what ドキドキ means? It is an onomatopoeia for the heart-pounding sound. So, ドキドキする is used to describe the feeling of nervousness, fear, thrill, or excitement.
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Note1: If you have things you want to say but don’t know how to write it in Japanese, just try to write some parts (eve just some words) and ask me how to write the rest! I can teach you or provide some hints.
Intended meaning: When I was writing this reply. My Japanese grammar is terrible so I’m afraid of looking like an idiot. (Oh well, making mistakes is part of the learning process is what I like to say to calm my overly anxious brain)