This is the 3309th most frequent Japanese word.
我
"我" (ga): "I" or "self" (often archaic or formal).
Here, '我が' (pronounced 'waga') is used in a possessive sense, meaning 'our' or 'my', often employed in a formal or literary context to describe one's own country.
我が国は豊かな文化遺産を持っています。
Our country has a rich cultural heritage.
In this sentence, '我' (pronounced 'ware') refers to oneself, often used in literary or poetic contexts to express personal feelings or thoughts.
我だけがこの世界で孤独を感じているのだろうか。
Am I the only one feeling loneliness in this world?
Here, '我々' (pronounced 'wareware') means 'we' or 'us'. It is a formal collective term referring to a group including the speaker.