身 | Means ‘me’ but usually it’s only used in certain set idioms, so don’t use this one when you write, unless you know the idiom. |
自分 | Means ‘me’ but also means ‘you’, like 彼が自分のゴハンを持ってきた.(He brought his own lunch). |
我 | Me (or, often, 我々, ‘us’) – kind of a pompous, old-man word.ZZZ |
己 | One’s self. LIT |
自我 | The self. Used only in psychology or philosophy. |