How about if there was somehow no expectation for you to talk, would eye contact be more comfortable? Maybe like at the dentist? Some people are wired to be uncomfortable with eye contact. But it’s probably more likely you are uncomfortable even as the listener bc you know you will be expected to talk soon. Try making eye contact with yourself in a mirror, while doing voluntary repetitions (choose words you can say easily, but add in a b-b-brief repetition)