I screwed up royally..i'm engaged to a girl i don't even like...indian wedding--help?

basically, i was born and raised in the USA, never been to India. not really that into hindu/indian culture. my parents are devout hindus and closely attached to india. i've always been rejected by american gals, who don't find me attractive. anyway, my mom recommended i start talking to an indian gal in ireland...we talked and she didn't seem too interesting. but i kept conversations going and within four months, she flew from ireland with her mom. at this point, i should have been wary of any gal that wants to be with me, unemployed. but she was so attractive and the idea of finally having a girlfriend seemed so great. i'm 28 and still haven't had a relationship. but this wasn't a girlfriend, this is a fiancee situation now. i realize after talking to her that she doesn/t like me, but likes my family...i also realize that she has no ambition for a career and that she lied about being interested in one to get me to marry her..anyway, i'm engaged to her and shes set a wedding date on nov.28...she said if i break up she'll kill herself....but if i don't, i'll be miserable. what should i do?