This is the 160th most frequent Russian word.
своего
"Своего" means "of one's own" or "one's."
'Своего' in this context is the genitive singular form of the reflexive possessive pronoun 'свой,' used to refer to a male friend belonging or associated with the subject.
Я жду своего друга.
I am waiting for my friend.
'Своего' here operates in the genitive singular masculine form to express possession of a teacher by the subject.
Она помнит своего учителя.
She remembers her teacher.
'Своими' is the instrumental plural form of 'свой,' illustrating possession of successes by the subjects.