I am disappointed myself.
I am disappointed at you.
I am disappointed in you.
I disappoint you.
Are they OK? If not, why?
Thank you
Hi,
I am disappointed with myself. Or 'in', but 'with' sounds better.
I am disappointed with/in you.
I am disappointed in you. OK
I disappoint you. OK
Prepositions are rather idiomatic.
Best wishes, Clive