The only other option is to wait until your fiance has finished college and has a job that pays him enough to cover the poverty guidelines for the affidavit of support. Or find a generous employed friend to sponsor you.
See the info at
http://www.visajourney.com LOTS of people there who've fallen into affidavit problems.
Unless you're qualified for some sort of work visa, then you'll just have to wait until such time as your fiance can prove he can support you.