。
Next year our college life starts.
Literal
Next-year we [topic-は] college life [subject-が] begins.
Note the double-marked structure: 私たちは (topic) and 大学生活が (subject of 始まる). This is the topic-subject double-nominative pattern: 'as for us, [our] college life begins.' は frames the speakers as topic; が marks the actual subject of the begin-event. A subtle but important Japanese pattern.