That is a good statement and I am not trying to think about the changes in my life that hurt.
Although here is a good example of a big change that impacted me greatly.
I had an aunt and uncle who would come over for our birthdays and would get my sisters and I nice gifts. When it wasn't the other sibling's birthday, they brought us each little presents. For example I would get nail polish sets or earrings. Then they decided to stop giving them to me after I turned 18 but did not really discuss it with me. This was even though I had a diagnosis but did not really live with Autism or around it. So when my sister and our cousin had their birthdays together that year, all of the gifts they bought went to both my two sisters. Yet, I did not feel 18 but felt like I was my cousin's age when she was 11 or 12. Although I did not have a tantrum, I felt kicked in the teeth and ended up crying for several hours until I fell asleep. Even though part of me wondered why it had happened, another part of me know why they stopped and so I asked them the next time I saw them upon apologizing.
Change use to make me have meltdowns all the time.