Im also curious about your disability. Even so, failing once is one thing. Failing four times while coming from a non-LCME accredited school? You should probably rethink this.
Did you pass on your fifth attempt? If so, there is something to be said for your stick-to-itiveness. If you havent passed yet your residency chances and medical career options are, quite frankly, crap.
Perhaps if you eventually pass step I you can try to pass the other steps and find a position in some bottom-tier, scut-heavy, malignant program somewhere. Ultimately try to get your license, which would provide you with more options down the road. However most states have a limit on the amount of time/attempts you have to pass all of the steps. Because youve failed step I four times, youre already disqualified in most states. And as an IMG, you cant just do a one-year internship. See the link below.
http://www.fsmb.org/usmle_eliinitial.html
If you choose to keep going, you have a very rough road ahead of you, with no room for error. I would move on to something else.