I’m always convinced I have STDs

For the past couple of months, I’ve had a really big fear of like my hand basically going down there or objects going down there and like being contaminated. This basically leads me to be scared of being on my own and doing things without people near (because if I do everything in front of someone they would tell me if I did something), also tucking my shirt. This started last October too and I remember crying for like hours everyday. Now I’m better but I do compulsions like tucking my shirt in a specific way so I know my hand couldn’t reach there. I’m scared to even get ready for the day, brush my teeth, etc with my shirt untucked because I’m scared those objects will be contaminated or I’ll do something to contaminate them. I’ve been trying to stop this compulsion of tucking my shirt in for a while but I’m not really going anywhere.

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

Sorry if this is tmi. In advance, I know some germs are fine - I'm all for that, and it definitely does ease some contamination anxiety. But I have lots of anxiety surrounding going to the bathroom, specifically number two. Again I'm so sorry if this is tmi. I went yesterday, and obviously my hands were contaminated because well, they are when you go to the bathroom. But also because I accidentally brushed the back of my hand against myself. When you're done in the bathroom you obviously put underwear back on, and trousers or whatever, but I wash my hands before touching my trousers but not underwear. So I do that bit before I wash my hands, but my hand, the very contaminated part, touched like a bit of my skin at my waist. At the time, I brushed it off, thinking that my trousers will cover that anyway for the time being. But then today, I wore leggings that are kind of small on me and they weren't as high waisted. And then I got in my bed, and had a t-shirt on, and probably touched so many things. I changed my t-shirt, meaning it touched my hair as I took it off. So now I'm paranoid I have poop particles all over me. I'm convinced I need to have a full shower again and wash my hair. I'm okay with having a shower, but I barely have enough energy for that let alone washing my hair too. I don't shower every day, so with my schedule, I'm not due to have one until tonight. I just want to be able to get up, get dressed, and go about my day. But how do I do that when my bed feels contaminated and I feel like I need to change the bedsheets. How do I cope when it feels like poop particles are in my HAIR. And that could totally be possible. I know some germs are fine. But I just don't know what to do.