Is it normal to cry in your car before going home?

Asking for a friend. (It's me. I'm the friend.) Some days I just sit in the parking lot for 10 mins before heading home and decompress. Work stress + home stress + being "on" all the time is a lot. My therapist says it's fine but I feel like I should just be happy to see my kids? Instead I sometimes feel guilty that I need this transition time. Anyone else do this or am I just broken?