I'm in a gay relationship but I'm not gay

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Or at least I think that's the case. I was incredibly lonely for the past 10 years and then I found someone online who would listen to me and care about me. At first it was nothing sexual but after a while I told him that I kinda fell in love with him. Maybe because I was worried that he would leave me at some point. To my surprise he actually was okay with that, we met up and now we're in a relationship.

I don't find men sexually attractive and to me it feels like the sex is a chore for me when I make him feel good and a chore for him when it's the other way around. I also didn't realize that I needed to do some emotional work as well, it can be tiring at times.

I don't know, I just feel like a terrible person. I feel like I'm deceiving him somehow but I also don't want to lose him. What should I do?

Picture entirely unrelated.