1. you can file for the divorce on the grounds of mental cruelty, but it will take many years,
also once you file contested divorce she will surely file/claim
Domestic Violence case
so be ready for them too,
2. if possible try to settle the matter amicably with your wife involving elders/relatives/friends etc and go for Mutual Consent Divorce which will be decided in 6-18 months, and you both will be free to live life with your wish,
don't forget to draft an MOU before approaching Mutual Divorce, which is the most essential and important part of a Divorce case,
some basic points to keep in mind and put in writing through an MOU before filing the petition for mutual consent divorce are custody of kids, distribution of assets (movable/immovable), quash/withdraw of pending litigation if any, Maintenance (present/future), Alimony, mode and time of making the payment, streedhan, future litigation, etc.
as far as custody of the 2 yrs old daughter is concerned you can file a case of custody
FYI the mother usually gets custody of the minor child, under the age of five but in case the mother is careless or ignorant towards the child, the father can get it.
after five it can be given to any parent.
various factors are considered while deciding custody petition like financial status, the welfare of the child, will/consent of the child, educational status, living standard, place, extra amenities, etc
The most important factor is the BEST INTEREST OF THE CHILD.