Adjective vs. Passive voice

[SARDORBEK]

(a) I'm interested in Greek culture.
(b) He’s worried about losing his job.
(c) I’m excited about going to Japan.

In these three sentences above are boldfaced words adjectives ending in -ed
or do they function as a passive voice? In some grammar books,
they are named --> stative passive
As a foreign student I cannot distinguish them :-(
Please, could You help me with the problem?

[Josef]

"Interested", "worried" and "excited" in your sentences are sometimes described as "stative passives that function like adjectives" ("stative" because they describe a prolonged "status" rather than "action", and "passive" because they occur in a superficially passive construction) OR as "adjectives". In either case, your sentences are in the active voice, not passive.