I am really struggling

I was just on the phone with my partner, it came up in conversation that they think they sound like a 10 yr old boy. I disagreed and said I didn’t think so but they said they really do think that. This has had me panicking all night as I am intimate with this person and hear their voice during intimacy and the idea that they actually sound like a young boy is really distressing to me. I really don’t know what to do, I’ve been panicking so much I can’t get to sleep.