There’s a lot of Japanese learner who use “Watashi” as a first person.

but actually it’s unnatural.(it depends on the time, situation and gender though)

To be used by woman is natural but to be used by man is kinda unnatural.

It’s natural for man to use “Watashi” in a business situation such as an interview, presentation and so on.

What should I use!?

It depends on your personality and gender. (kind, strong, diligent, etc)

A lot of first person exists in Japanese

Have you heard of the word”Mizuninagasu”?

A literal translation of “Mizuninagasu” is “Shedding something into water”

but actually this is not correct meaning!!!

“Mizuninagasu” means “forgive someone” ,”forget the past “, “Let bygones be bygones”

<example>

1.さっきの喧嘩は水に流そう　(sakki no kenka wa mizuninagasou) Let’t forget the quarrel.

・喧嘩(kenka):quarrel, fight, argument 　・さっき(sakki):just now

2.君のミスは水に流すから、頑張ってくれ。 （kimi no misu wa mizuninagasu kara,mata ganbattekure) I forgive your mistake, good luck

・君(kimi):you ・ミス(Misu):mistake ・頑張ってくれ(ganbattekure):good luck