Japanese Personal Pronouns are really hard to get for Japanese learners. In truth, we rarely use them. Not only “I” 「私・watashi」and “you”「あなた・anata」are hard to get, but third person
「彼」Kare and「彼女」Kanojo
Generally speaking, in the same way as anata (you), kare (he) and kanojo (she) are rarely used. However, in recent years, perhaps due to the influence of foreign language (particularly English), it has come into use when referring to a person objectively. That said, when used in reference to a socially superior person, it can sound a tad bit impolite. Additionally, it can also be made to sound distant from your family members or other people close to you. Nevertheless, it would still be more natural to call these people by their name or title
1)（近所の人との会話）
A: あら、今日は一人？お子さんは？
B: 主人のお母さんが見てくれています。彼女が 母が
（Kinjyo no hito tono kaiwa）
A: Ara, kyou wa hitori? Okosan wa?
B: Shuji no okaasan ga mite kurete imasu.kanojyo ga haha ga
(Conversation between people in the neighborhood)
A: Oh, you’re on your own today? What about your children?
B: My husband’s mother is watching them.her mother
2)（初対面の人と）
A: ご家族は？
B: 妻と娘一人です。彼女は 娘は
(Shotaimen no hito to)
A: Gokazoku wa?
B: Tsuma to musume hitori desu.Kanojyo wa Musume wa go-sai desu.
(People meeting for the first time)
A: Do you have a family?
B: I have a wife and a daughter. She My daughter is five.
「私」Watashi
As for the first-person pronoun watashi 「私 ・watashi」, “I” , would be rarely used in Japanese. This is because in cases where there is a common ground in terms of the setting, the subject of the sentence would be deemed as unnecessary and would, therefore, get omitted
(自己紹介)
(私は) 家庭教師の岡村です。よろしくお願いします。
(Jikoshoukai）
(Watashi wa) Katei kyoushi no Okamura desu. Yoroshiku onegaishimasu.
(Self Introduction)
Furthermore, there are some people who do not even use “watashi”. The will refer to themselves by their own title from the third-person point of view.
In these cases, the person to whom they are speaking is clearly a child. For example, a grandfather may say to a grandchild:
「おじいちゃん（私）は若いときはかっこよかったんだよ。」
“Ojiichan (=watashi) wa wakaitoki wa kakko yokattandayo.”
“Grandfather (I) was good-looking when I was young”
And a teacher may say to a student:
「先生（私）が言うとおりにやってね。」
“Sensei (=watashi) ga iu toori ni yattene”
Conversely, small children often refer to themselves by name rather than using ‘watashi.’
「えりこ（私）はね、いちごが食べたいの。」
“Eriko (=watashi) wa ne, ichigo ga tabetai no.”
In rare cases, some people still continue
Click this link to read about common mistakes in Japanese, Ki o Tsukete!