j'ai passé ou je suis passé

Bonjour Sarah !

The verb "passer" belongs to this group of verbs that could use either "avoir" or "être" as auxiliary in Le Passé Composé. It depends on the context and the meaning of "passer".

You can have a look at our related lesson:
Passer can be used with avoir or être in compound tenses depending on its meaning in French (Le Passé Composé)

I hope that's helpful!
À bientôt !