I need advice really bad please

So I (17M)am panicking really bad because this morning went so poorly like really bad because I woke up so late and I barely had time to shower like 3 minutes I had to shower and this is bad because I had no shampoo and I had to use my body wash to clean my hair my face and body and I was showering in the shower I usually avoid because the shower curtain is gross and turning yellow and I have been meaning to wash it and it’s the shower I use to wash up after I have a private moment and I have bad contamination ocd about s3m3n and I feel so sure there was that stuff on the shower curtain inside it because I do not clean the shower and before I shower my body is touching the curtain so it gets dirty with s3m3n and I was so scared to even place my towel and wash cloth on top of the shower rod because it was touching the curtain and the rod most likely had s3m3n on it and this gets worse because in my panicking I left and the shower curtain open to avoid having to touch it and water got all over the floor and when I was showering I am pretty sure I did not shower well enough and this matters because for the last like 2 months I have been sleeping on the floor in my house on a rug that’s in a public room kind of and I am so worried the rug has s3m3n contamination like I am 90% sure it does but I still sleep on it and I make sure to shower before I do anything that may involve things that may touch my body but this makes everything worse. And on top of this my uncle sleeps in my room and I know my room is contaminated because it’s my room and I am 17 and he touched everything but more specifically the front door handle and yesterday I touched it after him to leave the house with my dad to go to school and my hand was contaminated I knew it and I touch the car door handle and my backpack and I have been scared my backpack was contaminated and I touched the stuff in my backpack afterwards so now I have to find out how to clean my backpack and my items. But today things were just worse after my panicking and quick shower I barely washed my hands so I am worried I got s3m3n everywhere and it is spread around my house now and now none of my stuff will be clean and now I will contaminate my friends and their stuff and my notebooks are dirty now and my computer and everything and I have to hang out with my friend tomorrow and I am So scared I am thinking of canceling but kind of don’t want to cause it’s Halloween. But the bathroom and my backpack and my stuff and the house and the door everything my little brother used the bathroom I showering and I feel sick my clothes were still on the ground and I did not clean the soap pump or faucet handle so he is probably contained and he was preparing for a hair appointment so he looked around the bathroom cabinets that are close to the floor for a brush and conditioner and he got it from my box of stuff and I think contaminate because ai had that box before I was trying to be more clean with s3m3n and was just dirty and barely if at all cleaned myself so now I am worried my brother has that stuff in his hair and stuff and he showered in the other bathroom and touched my drawer in there and I am scared to touch it because of contamination but he touched it and then touched his and opened his and grabbed his toothbrush and stuff and the shower I did not clean other after I got out the handles and this is so much and I am being crushed I put my backpack somewhere that I also think is contaminated so idk how to handle my backpack like do I just take the stuff out and wash or clean everything in my backpack or throw it out this is sickening and I just want everyone to be safe and clean and it’s my fault. I also feel like I am not saying everything that matters that if I miss a point I may be lying to you guys or if I do not clean a spot then the s3m3n will spread everywhere again. I need advice because now I have so much to clean and have to figure out how to clean my car seat and car handles because those are most likely contaminated too. What do I do about my backpack