i'm the same way, i never stopped studying on my own once i got out of college.
check around for free sit-in online classes, alot of schools do that but it's really rare you can sit in on a whole term
there's also ted.com lectures, fascinating and ever-optimistic
and you can learn alot from wikipedia, i average about 4hrs a day there reading everything from history to applied sciences
only thing i can't learn there is math... even the simplest topics are explained in full-on jargon