There are no hikikomori because if you miss a lot of school social workers will come to your house. And parents are much tougher in the US, many of them will kick your ass if you try to take advantage of them.

My problem with hikikomori is that they are using other people - they are not working or going to school, but they expect to be fed, have electricity, and shelter at the expense of their family.

If you want to lock yourself in your room and do nothing in your free time, that's fine, just get a part-time job in the daytime so you aren't a complete waste of resources.