Peer review for the lay person
The fact that you're not in academia is not proibitive for publication, but it sure makes things more difficult. If you think your paper is well written in the sense that it looks like an usual physics paper, you can simply find a proper journal and just submit your work.

But I'd recommend first making your work available online to get opinion from people in the field, as they can point you to the proper journal to submit, they can help you with your writting and, more importantly, they can check if what you claim makes sense or not. I'd recommend posting a question to Physics.SE about the issue you found with a link to your paper.