coming out?? idk whats wrong w me

so there's a guy who likes me, i accepted him and we're dating, because i like the attention he gives me. but i don't seem to like him yet. yesterday we had our first date, and he said i love you many times, i felt awkward. this is the first time i'm dating in my whole life, i don't understand. This morning I woke up and felt nauseous, I felt disgusted at the thought of me being close to a guy, me dating a guy, it made me so nauseous. I always feel disgusted if someone approaches me, and it happens if the person who approaches me is a guy.
but I feel fine, and I feel comfortable if the one who approaches me is a girl, I feel more comfortable if I'm surrounded by women... I'm confused, am I a lesbian? but I'm not interested in dating a girl. but, if I date a guy I feel sick. am I aroace?
and i know this is very bad, because i'm in a relationship right now, i know he likes me, i'm a date to marry person, but i can't see a future with my boyfriend right now. i feel sorry for my boyfriend because i feel like this, i can't look at his face because i feel disgusted...
What do you think my sexuality is?