I think you're mixing up transference and attachment.

Transference is taking past feelings from others and putting them on your T. For example, I get these times where I am terrified of my T, even though she has done nothing to make me scared. Why? Because I am afraid of what she might do because in the past, others have done certain things to me to make me afraid.

Attachment is a connection with your T. It could be fear-based (preoccupied), distant (avoidant), or a mixture (disorganized). Or it could be secure and trusting. This is based on how you learned to relate to others generally.

There's a connection between transference and attachment in that the same situations that brought about the emotions you're transferring onto your T are the same ones (most likely) that formed your attachment style. So there will be overlap. But they are two different things.