The marriage is a love marriage. File a complaint against them under the domestic violence act and for cruelty and demand of money. Also you can file a complaint against them under the relevant provisions of the sc st act as they have also abused you for belonging to a particular caste.
He cannot obtain divorce automatically. A petition has to be filed first and you would be heard before the case is decided.
Divorce proceedings cannot be initiated before 1 year from the date of marriage.
Regards