I found this on your State Bar Association site:
9-12-201. Grounds.
When either of the parties to a marriage is incapable, from want of age or understanding, of consenting to any marriage, or is incapable of entering into the marriage state due to physical causes, or where the consent of either party shall have been obtained by force or fraud, the marriage shall be void from the time its nullity shall be declared by a court of competent jurisdiction.
History. Rev. Stat., ch. 94, § 5; C. & M. Dig., § 7041; Pope's Dig., § 9021; A.S.A. 1947, § 55-106.
This is the site, give it a read and then I'd suggest you seek advice from a lawyer to make sure that you fit the criteria for an annulment as opposed to a divorce. Good luck.
http://www.arkleg.state.ar.us/newwebcode/lpext.dll/Infobase/77ff/7883/7b2e?f=templates&fn=document-frame.htm&q=annulment&x=Simple&2.0#LPHit1