This is the 557th most frequent Russian word.
сво
"Сво" is not a standalone Russian word; it is likely part of a larger word (e.g., "свой" meaning "one's own").
Here, 'свою' indicates possession pertaining to the subject 'я' (I). It is adjusted to agree in gender, number, and case with the noun 'комнату' (room), which is feminine, singular, and in the accusative case.
Я пошёл в свою комнату.
I went to my room.
The word 'своём' here relates to 'каждый' (everyone) to express possession, adjusted for the prepositional case and singular number of 'будущем' (future).
Каждый думал о своём будущем.
Everyone thought about their own future.
The word 'свои' indicates possession referring back to the plural subject 'мы' (we), and it agrees in number and case with 'семьи' (families, plural accusative).