Hello I am a brahmin girl and I am in love with a khayasth boy since 3 years but my parents are not ready for it and every time behaving like I am the most bad girl in country and always said that if I will not marry with a brahmin guy they will suicide due to social factor because I am from a small city and there is lot of problem due to different caste,they think that if I will marry a non brahmin guy than no one will marry to my younger brother and sister .but I am not able to live without that guy and also love my parents very much.Please suggest me as soon as possible.
Thank you...

Introduce that guy to your parents as a friend.then after some time try to convince them.

You may have to face the fact that they will never agree to a marriage with this fellow, and I think you both have to agree on what course of action to take looking forward.

Put your heads together, and see what options you have, even if you must consult with a respect official of your faith.