This weights heavily on my shoulders...

I'm having an extremely hard time trying to find my sexual orientation...I've only ever dated men(except for once in the 9th grade) and have only "been with" men...it's always weird because it's usually very intense in the beginning but over time in a relationship the sexual desire is just not their anymore, and honestly it's never been satisfying for me... when I think about going on a date with a woman it scares me because I wouldn't even know what to do if I was with a girl I found attractive. How would I flirt with her? It makes me nervous. Everytime I see a girl I'm attracted to it makes my heart race and feel stuff I usually don't. This is leading me to believe that I actually might be more attracted to girls...

The problem that I'm facing right now with these feelings is that I'm currently in a relationship. I've been with this man for almost a year, we've been living together throughout the whole relationship. I've tried to make a home here but it's starting to feel like I'm living with a roommate and not a partner... I'm never "in the mood" and I only ever do it for him... I feel as if I'm not being fair to him or myself. I care for him deeply but not romantically.(if that makes sense?)

So I guess with all of this in mind, the problem I'm currently facing is that I don't know how to express my feelings or concerns with the person I'm currently committed to. I'm scared it might end in a fight and even having him kick me out of the house. I'm lost.