认为自己是

consider oneself to be

→ 认为
phrase Rare #32,821
consider oneself to be Used before a description or identity to express what someone thinks or believes about themselves.
CH: 他认为自己是一个很有耐心的人。
EN: He considers himself to be a very patient person.

并认为自己是一场阴谋的受害者

And believed himself to be the victim of a conspiracy.

— 看不见的客人 (2017)

他们认为自己是幸运的。

They consider themselves lucky.