Is it antisemitic for someone to think I’m Jewish because of my nose?

I’m gentile, to my knowledge I don’t have any Jewish ancestors. Despite this, in both middle and high school I’ve had people ask if I’m Jewish or just assume that I am. Both times, they said (or I overheard them say) that they thought this because of my nose (which is moderately larger than average I guess), and neither of these people are Jewish.

It gave me a weird feeling, but I also have separate gripes with both of these people. Was this some form of unconscious antisemitism from them, or am I imaging things?

I’m sorry if this post doesn’t belong here, I can delete it if need be.