You need to choose to love who you want to love. Otherwise, you won't be happy in the long run.
Its OK to stand up to your parents. You're grown and are capable of following your own heart.
Times have changed. This is the year 2014 , not 1014, know what I mean? People are more and more accepting of each other these days.... I don't think your parents got that memo.

Don't feel guilty about loving who you love. This is YOUR life, nobody else's.