I dunno about amphetamines not being as dangerous as benzos. I can write you a book on my experience with meth amphetamine and at least that one is very dangerous.

If you really need it for ADHD but have addiction problems if you come clean with everyone maybe a solution can be worked out. Like your mom knows the problem but will be serious about giving you the prescribed dose. Maybe think about getting treatment for the addiction stuff. If you took one of my drugs away I would just find another. No big deal. I had to treat my addiction along with my mental health issues. Addiction is not fun at all when you know you have a problem but can't seem to get it under control. I can almost guarantee that coming clean to the world will be a relief. Once you lay the problem out there then it is easier to do something about it.