Had a dream my mom and sister left me

I had a dream that they were getting all dressed up to go somewhere, doing their make up and wearing nice clothes and high heels and everything. I didn't know where they were going but I felt really left out in my dream. They were ignoring me. They told me I couldn't go with them and they both just left me alone in a room by myself. I cried and begged to go with them but they refused to let me. They looked really happy and excited to go wherever they were going.
In my dream I noticed a strange look on my mom's face, almost like pain or emotional distress for me. But she still refused to let me go with them. My sister didn't care in my dream.

This I think holds a lot of meaning for my relationship with them.
In particular I remember one day when I was about 10, my mom told me I couldn't go shopping and spend the day with her and my sister, for no other reason than she just wanted to go shopping with only my sister and not me. I literally ran out of the house crying and yelling after them, then sitting on the driveway pavement with tears running down my face. 5 minutes after they drove away, they came back and picked me up to go with them...kind of cruel if you ask me.

Why would I have this dream so many years later though? Shouldn't I be over these emotions from way back in my childhood? Is it a deep subconscious feeling I haven't resolved?

Are you feeling left out in real life? This dream may mean you do not want to go with your old childhood feelings. I feel it was best that they left you. Past emotional distress has left you behind.