I spend a lot of time interpreting my own dreams and the symbolism.

My first impression:

The furniture and the store represent the constant in your life, the basics, the fundamental elements, whether it be family or extended family or basically the solid elements of your childhood.

In your dream, you lag behind your sisters and they don't notice. Often the older siblings are either not interested or out of touch with what is really happening in the little sibling's life.

In my dreams, black and white represent good and bad, light and dark, opposites. Something that does not have nuance or flexibility... the truth rather than opinion.

You shout at this nonspecific dream figure as you leave the store that your mother sexually abused you.

What I see is that you are struggling to exit the 'store' of your past, trying to escape. As you exit, the reality is real, undeniable. The nonspecific person who is trying to keep you from escaping is trying to keep you from acknowledging the truth. And so you shout the truth at them as you stand in the realm of black and white... either it happened or it didn't... no way to just kind of haze over the truth. And so you shout and you make your escape.

It is a sign that you are processing all of this, trying to heal from it. Does this all make sense?

*big hugs*

Dreams can be scary, but they are also a good insight into what your brain knows.