Hi Siva,
Annulment is a legal procedure for declaring a marriage null and void. With the exception of bigamy and not meeting the minimum age requirement for marriage, it is rarely granted. A marriage can be declared null and void if certain legal requirements were not met at the time of the marriage. If these legal requirements were not met then the marriage is considered to have never existed in the eyes of the law. This process is called annulment. It is very different from divorce in that while a divorce dissolves a marriage that has existed, a marriage that is annulled never existed at all. Thus unlike divorce, it is retroactive: an annulled marriage is considered never to have existed.
Grounds For Annulment
The grounds for a marriage annulment may vary according to the different legal jurisdictions, but are generally limited to fraud, bigamy, blood relationship and mental incompetence including the following:
1) Either spouse was already married to someone else at the time of the marriage in question;
2) Either spouse was too young to be married, or too young without required court or parental consent. (In some cases, such a marriage is still valid if it continues well beyond the younger spouse's reaching marriageable age);
3) Either spouse was under the influence of drugs or alcohol at the time of the marriage;
4) Either spouse was mentally incompetent at the time of the marriage;
5) If the consent to the marriage was based on fraud or force;
6) Either spouse was physically incapable to be married (typically, chronically unable to have s*xual intercourse) at the time of the marriage;
7) The marriage is prohibited by law due to the relationship between the parties. This is the "prohibited degree of consanguinity", or blood relationship between the parties. The most common legal relationship is 2nd cousins; the legality of such relationship between 1st cousins varies around the world.
8) Prisoners sentenced to a term of life imprisonment may not marry.
9) Concealment (e.g. one of the parties concealed a drug addiction, prior criminal record or having a s*xually transmitted disease)
Please read follwoing threads carefully where annulment has been discussed. It will clarify your doubts further :
https://www.legalserviceindia.com/forum/display_topic_threads.asp?ForumID=35&TopicID=8856&SearchPagePosition=1&search=consummated+your+marriage&searchMode=allwords&searchIn=Thread&forum=35&searchSort=dateDESC&ReturnPage=Search
https://www.legalserviceindia.com/forum/display_topic_threads.asp?ForumID=35&TopicID=8567&SearchPagePosition=1&search=consummated+your+marriage&searchMode=allwords&searchIn=Thread&forum=35&searchSort=dateDESC&ReturnPage=Search
https://www.legalserviceindia.com/forum/display_topic_threads.asp?ForumID=35&TopicID=8827&SearchPagePosition=1&search=consummated+your+marriage&searchMode=allwords&searchIn=Thread&forum=35&searchSort=dateDESC&ReturnPage=Search
https://www.legalserviceindia.com/forum/display_topic_threads.asp?ForumID=35&TopicID=8083&SearchPagePosition=1&search=consummated+your+marriage&searchMode=allwords&searchIn=Thread&forum=35&searchSort=dateDESC&ReturnPage=Search
Although it is not clear from your posts wether you have any physical relations with your wife or not. But if there has been no physical relations between both of you then it means that your marriage has not been consummated. Therefore, it can be annuled on the basis of non-consummation of marriage.
Rest of the grounds have been discussed above.
Hope this helps!