Am I selfish for not wanting my mom to invite people along as we do errands relating to me?

I rely on my mom for transportation. She gives me a ride to work and to other places. When I run errands I like to do it together (my mom and I). It irks me when she gives me a ride to work in the morning and she invites my cousin to go along. I like to get to work in silence. Recently I had to visit my aunt for something personal, and she invited my cousin (12). When it comes to personal errands I do not see it as a fun activity and I do not appreciate her inviting other people. I told her about it and she claimed I was being rude. I’m going to work at 8 in the morning not going to to a party. Even when it comes to going shopping, I’ll rather do it with her or alone. I’m not being rude or selfish it’s just that I do not like making a personal activity a family affair.
Am I selfish for not wanting my mom to invite people along as we do errands relating to me?
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