Firstly, I'm yet unfamiliar with the query conventions specific to this stack exchange. If I've improperly tagged or placed this question, such that it need be closed or held, I apologize.
Continuing, I'll be brief (To be so, I will mostly omit the anecdotal lead. At anyone's request, however, I'm more than happy to explain.*):
I'm 21. I dropped out of art school during 2016, have graduated high school in 2015, returning in 2017, getting expelled a week later, enrolling in community college classes a few months later, dropping out some weeks later, enrolling at and attending a second art school in 2018 (spring semester), flunking out of my financial aid and scholarship.
A series of events brought me to physics and mathematics. Manic obsession mildly describes my rapture.
I have dreams, lurid, about sequent calculus. I'm a quite, quite well-practiced autodidact. I read a lot. Springer's (among many others') Graduate Texts in physics, mathematics, computer science. I have exhausted all of MIT's Open Courseware offered for physics and mathematics at the undergraduate and graduate levels.
I have realized only how little I know, how far I've still to go -- the limits of autodidactic way.
I have pre-calculus -- twice. I have never taken a physics class. (1: Understanding MIT's 'open courseware,' by some, are considered 'course', I'm using the term strictly for that of a credit granting environment).
I need to earn a PhD. I need to participate.
The dilemma: Getting in the door. I, no matter how competent or incompetent, have nothing to show for it. I'm clearly not a competitive candidate (if not an all together joke) for any undergraduate program of the formal and/or physical sciences.
The question(s): how, given these circumstances, can I (be it conventionally or unconventionally) become competitive (at the undergraduate level of the US college system)? If that is too subjective - where might I find resources, if they exist, that will best allow me to answer (successfully) the above question?
I acknowledge the difficulty, and surrender to the patience it will doubtlessly require.
Thanks much for your time.
p.s. again, autobiographic details by request