Am I overthinking this??

I don’t know what to do I’ve been seeing this guy for roughly 4-5 months and I like him so much like he could be the one. He was in town for something for most of the time we’ve been seeing each other but he recently moved back to his state which is pretty far away. I’m absolutely terrified that I’m going to accidentally get an STD from somewhere like a toilet seat or the other day after taking the bus home I forgot to wash or sanitize my hands before wiping plus I’ve had coworkers and even my roommate admit that they’ve had chlamydia and one has HSV. I’m terrified that I’ll get something and he’ll think I cheated and we’ve both been hurt like that before and I wouldn’t want to put him through that or have him think that of me. I’ve been trying to not google anything or go to the doctors bc those are my compulsion and reassurance seeking things but nothing is helping it’s to the point I don’t want to use the bathroom or do anything does anyone have any tips to help it’s starting to effect my life I know this isn’t possible but I keep thinking it would just be my luck that I’d the odd one out it does happen to

So everything has been going well recently. The only thing pressing is for peace of mind I am getting STD tested on Wednesday morning and I am pretty anxious about what the result will say. I go to certain massage parlors that offer extras. And I have made a point to not engage in intercourse but other non-intercourse things I have done. I was afraid that since those women do other things with people that maybe virtual things were left on the beds I would lay down on or something. I told this to a doctor I saw recently and they said it was highly unlikely. But I still have the health worry. But we will see come Wednesday. The only reason I am going is because I went to the urologist and they wanted me to rule things out since I had what seemed like a UTI but it turned out to not be the case. What's a good way to not focus on catastrophizing the situation. I keep worrying that my life is over if I am diagnosed with something and my future relationships will be tainted or I'll put someones health in jeopardy

In September I had unprotected oral sex. I haven’t had sex in five years because even before that I was so ashamed and worried about sex. I finally did it and then a few weeks later while I was at work I started to be very itchy all in my underwear area like up to my butt. I didnt see any blisters or anything but when I googled it, herpes came up. Eventually I thought maybe it was the new underwear I bought and it went away after I stopped wearing them. However it’s returned twice, mostly when I’m really worried about herpes. I know this makes little sense because I don’t thinking about it would cause an outbreak but, either way I’m really nervous to go get tested because I heard there’s a high false positive rate and if I get a positive there’s a huge chance I will just become a recluse and never speak to anyone again. I already have so much trauma with sex, vaginismus, etc. I can’t imagine telling anyone I have herpes and then they 1) don’t want to be with me 2) now know this and could tell anyone they want Even if I don’t have it I was reading it could be asymptomatic and 80% of people who have it don’t even know, so now I’m worried I will get it no matter what sex I have. I can barely handle staying alive with just OCD but now with social stigma with herpes I will feel like I can not even live a normal life. I am already freaking out about it and don’t know what to do. I am worried to go get tested and it saying I have it, and then I’m worried to not and potentially spread it, I’m not even having sex with anyone right now so it’s not like I would. But I’m worried I will forget to wash my hands and touch something and someone else will touch it and then get it. I’m just having a really bad time.