Hard to tell without having watched the circumstances over a period of time.....But I think it could have something to do with your being in the hospital so long and not immediately in the arms of your mom who could have taken you home very soon. I've also read that very premature babies have a more piercing cry that can be more nerve-wracking than the average baby's cry.

My twin sis and I were a month premature, but we attached. I stayed in the hospital 2 weeks, and my sis 1 week, if I remember correctly.

Or if could have been something about how your mom treated you, that might or might not have been due to your being premature. She might have treated you the same way had you been full-term. That could be a likely possibility since you even told your mom you liked other moms best. Do you think if they were your moms, you could have attached to them?