Tweak is an account by Nic Sheff of his own meth and heroin addiction as a teenager, told in his own voice, not by a parent or a counselor. It is a paid paperback, about fifteen dollars, with no membership or account needed beyond buying or borrowing a copy. It does not soften what addiction actually looked like for him, so expect a hard and sometimes graphic read, not a gentle one. If you want to read someone your own age describe what it was actually like from inside it, this is that book.