Hi, maybe I could help you(:
Now I don't believe you should be in a mental hospital, and I'm a teen, just like you(:
I do believe it would be safe to tell her, I do not know anything about your family but if she's a good mother [which I hope she is] then I don't think she'd put you in a mental facility, but yet like to talk it out; help you.
I do not know if your goal is to quit or not [but if it is,then I think reaching out would be a milestone] but I think if anything, confiding in her would be a good idea(:
Hope I helped you!:D
I'd love feedback!(: