Struggling really bad today please help

Hi All, I (22F) have been suffering from HOCD for the past three months. I am engaged to the man I want to be with. However, I can't kick OCD. I was recently aroused when looking at a model in lingerie. The lingerie was objectively sexy and I briefly thought about how she was posing for a man with her breasts out. Likewise, I thought about how sexy it would be if I wore that. But, now I'm terrified. If I can get these responses from the female body-not the male body-that must surely mean something. Likewise, I have trouble orgasming during sex and I don't always love making out. But, I really don't think I'm a lesbian? Long story short, I need help getting over this. I'm in college and I can barely study. All I do is worry. I can't even enjoy my engagement at this rate because I'm convinced I'm in denial. This sexual arousal gives me incredible amounts of anxiety, especially considering I have been turned on by stuff like this in the past. If anyone has any helpful words, please let me know. I am not seeking reassurance, but I felt this backstory was necessary to explain why this fear has been so potent. There may be some real attraction here, which terrifies me. I don't know what to do. I want to enjoy life and improve sex with my fiance but I'm feeling hopeless. If anyone has any words of advice, it would be deeply appreciated.

Hi guys, Straight female here. Having a tough night. I guess I'm ruminating on how this OCD started, I was browsing an app and came across half naked anime girls and I guess sexual images in general arouse me (I'm not sure why), but then I froze and told myself "oh my God, I must be a lesbian and I can't be with my boyfriend anymore." Ever since then, I've been checking and checking and checking some more. I've managed to not research anything (which I'm proud of), but it's just so unbearable, I'm worried I'm somehow in denial or something because the thoughts at first didn't really give me much anxiety but now I'm very stressed out. I keep thinking about my past and if I was a normal "straight" person, and wondering if I'm somehow actually a lesbian. I keep having awful dreams about it. Ironically, I can still be intimate with my boyfriend and somewhat enjoy sex but other times not so much and my brain tells me I am lying to myself. I keep trying to reassure myself that I'm not homosexual. I can't even fall asleep tonight. I checked my stress levels on my health app and its through the roof. I just want to feel like I used to and be confident about my identity, but my brain tells me that I only enjoyed sex with my boyfriend back then because it was new and exciting and just a fling. Before all this, I was only ever attracted to men and only had male crushes. Now, I find it hard to even understand what's going on and I find more comfort in wondering if I'm just asexual so that I don't have to deal with it. I'm physically shaking writing about this because I feel so hopeless. Just a few hours ago, I thought I had a breakthrough and I was feeling alright. I accepted the thoughts as they were and I was going along with it. But now it's triggered again because I'm not sure if they're intrusive thoughts or me being in denial, because I keep having to reassure myself that I'm not homosexual and that I'm attracted to men. The guilt of how it all started is keeping me from moving on because it is somehow proof that I am not straight. This is awful. It feels good to write it out. Thanks for reading.

So now it's switched to sending me images of women either doing graphic sexual acts on each other, or doing them on me! (Followed by a groinal response). The content is starting to bother me less, but the sensations I get after these thoughts (grounal), is what worries me?! I have never had a desire to "experiment" with woman because women are only aesthetically attractive to ME, its never really been sexual. So WHY do I keep sexualizing random women on the street?! On top of this, I feel like I've been noticing men less since this started about a year ago.