English Translation
This hat is too small for me.
Ambiguous sentence?
Literally the sentence is "This hat of mine is small” - a statement of fact about the speaker’s own hat.
But it can also be taken figuratively to mean that the speaker’s experience is that this hat is too small for them “This hat is too small for me”.
In this case it could be more explicitly stated as “Αυτό το καπέλο είναι πολύ μικρό για μένα” to convey the idea clearly that the hat is too small for the speaker.