You say you are attracted to Girls. You are also interested in watching Porn movies showing girls masturbating. You are switching off porn movie if you see a guy behind the camera.
You said that eventhough you love your boyfriend, you are not attracted to him physically.
You are basically a lesbion. There is nothing wrong in being a Lesbion. If you get good gilr friend and if you mutually agree and trust each other you can enjoy your sexual act as a Lesbian.
I am straight but had some girl experience. In my experience, what defines you is who you fall in love with.
I do have lesbian fantasies but never was in love with a girl. I'd say you are into girls. Hey, lady, enjoy!
I'm sure you're straight. Just to give you encouragement, I was an early breast developer at age 9 and the first in my class to grow boobs. I envied the girls who were older than me because most of them were still flat chested. I got teased at School by the girls in my class for having to wear a 38 size bra when they didn't have to. It's just a matter of girls interests.
Everything you said indicates that you are a lesbian ...not heterosexual ... Not bisexual .... a lesbian. But there is only one way you will know for sure. Stop languishing over the issue! You will wear yourself into a frazzle. Invite an attractive girl to your house for a sleepover. When the rest of the house is asleep, ask her what she thinks about other girls. If her conversation indicates that she is curious about girls, kiss her. if the kids lingers, that indicates that she is open to going further. Stroke her arms. Miss her on her neck below her ear. I she is open to that stroke her breasts while you are still kissing. If she doesn't object to this after a few minutes, move your hand between her legs and start running her there. If she spreads her legs or moans, put your hand inside her panties and continue rubbing while kissing her breasts. If her pubic area starts feeling warm, wet and swollen, then decide if you want to go further by moving your kisses and licks to between her legs, to bring her to the heights of a lesbian orgasm.
If you are unsure about doing any of this, find an older girl/woman who can lead you to lesbian sex. That's what I did when I was ten. I asked one of my after school day care projectors about lesbian sex. She discretely took me into the first aid room locked the door. Took off my clothes. Kissed me passionately. Her kisses moved across my body until she picked and kissed my coochie and gave me my first explosive orgasm. From that point I knew that I was a lesbian. It was a course that I stayed on to this day. Although, I'm married and have two children, I hate sex with my husband and having to take it. I have tried but having sex with a white man is repulsive and doesn't do anything for me. Only a very well endowed black man can come anywhere near lesbian sex, but women still win by a long shot.
I only wish that I could do more to guide you to the joys of lesbian sex, like Me Jane, my after school day care proctoring did for me. It is a choice that I have never regretted.