I是人称代词中第一人称主格单数,we是人称代词中第一人称主格复数。
主格人称代词:I,he,she,it,you, they,we ;
宾格人称代词:me,him,she,it,you,them,us;
名词性物主代词:mine,his,hers,its,yours,theirs,ours;
形容词性物主代词:my,his,her,its,your,their,our;
单数形式反身代词:myself,himself,herself,itself,yourself;
复数形式反身代词:ourselves,themselves,themselves,themselves,yourselves.
we用的是复数,是我们的意思;I用的是 单数,是我的意思,他们都是第一人称.
we:我们 I :我