you could alter the words to make it work for you, or you could use a spell designed to attract a specific gender [while i've seen spells of this nature, i've never seen one that says 'only works on straight people'] i would just be careful what you wish for, spells have this nasty habit of hurting you if you didn't think them through [example, more people are attracted to you, but none of them share similar interests as you]
if i were you i would let nature take it's course. if i did cast a spell, i would make a love charm to bring more love into my life, but not a specific person. you can personalize it and when casting visualize yourself in a same sex relationship [but try not to picture someone you know, i usually visualize a person but not their face] you cast the spell, so you can put in and specify what works for you. spells can be altered, they're not set in stone.