Have no feelings towards a girl who likes me, should I loose my virginity with her?

Sorry for possible grammar mistakes, not a native speaker.

I met a girl this august, and for the first couple of weeks we had a nice thing going on. She is smart, funny, she genuinely likes me. But I don't like her back, and, after three months, I can't say I love her company. More and more often I start to regret meeting her, I dislike her friends, I dislike her tastes in music, films, books etc., I dislike her quirks, her fetishes and so on and so on. She stole my first kiss (I'm 22) and it also pisses me off. The only thing that attracts me right now is her body. I was quite open about my feelings towards her but I still feel like an asshole here, because it's been a month and we're still kind of flirting, kissing etc., even though she told me that we have no obligations to each other. I know she wants to have sex with me, but I'm very unsure if we should do it. I don't want her to get more attached and I don't want to feel guilty for "using" her as an opportunity to loose my virginity. I don't even know if it is worth it now. What should I do?