I don't have much to add, but I feel like your Mom is a bit wrong - I think especially at an older age, starting a new job is very intimidating. I had a lot of different jobs when I was younger and I found it takes 3 months to adapt to a new job. I know not everyone will take that long, but for me that's how long it took to feel comfortable. I was also very careful to get the "lay of the land" for a few weeks before clicking with anyone socially. Not always easy as I am naturally talkative!