I'm sorry that happened. I'm glad your mom cares so much for you, that she did that to keep you safe.
It won't always be so strict, once she is sure how you do with the computer. I would do the same with my sons if they were still young and in my home, btw. There's a lot of garbage out there, that sometimes it almost catches me, and I am hypervigilant and savvy

We need all the help we can get on the net, to stay safe, imo.
TC Glad you're here at pc!