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Everyone lives and eats different in their household. If the kitchen and bathroom seem messy I get paranoid about the food. One time eating at a friends place. All her plates smelled like raw eggs. Even the wine glasses! Also some households  have weird smells in their house. Makes me uncomfortable eating their food
It is a weird cultural aspect, in some places, it is seen as rude not to give people food. I live in New Zealand and a big part of the local Māori Tikanga is feeding people in your house, it is seen as respectful and welcoming. So it is so hard being in your shoes. >

I completely understand this, my family is Mexican and it’s basically written in stone to feed guests. Which basically is the bane of my existence and I feel ungrateful but I can’t force myself to be so uncomfortable just for tradition. >

Do you eat in restaurants?  
Those are super dicey.  I don't like eating in places were I cannot see the kitchen. >

It depends, sometimes I can detach myself enough to eat certain places if they’re higher end. With fast food I’ll usually only eat places I worked when I was younger or know I have a safe food there that I’m willing to risk germs for >

That sucks, I feel like that’s significantly limiting your life experience. Most of the best food I’ve had were random cheapish restaurants >

I love eating at other people’s houses: I don’t have to cook, I don’t have to clean, and I get to try someone else’s cooking. If it’s yummy, awesome; if it’s meh, at least I’m full; if it’s disgusting, it’s a fun story for later, and at least I’m full. >

I would love for this to be my case, for me though a bad meal is like one step away from a sensory meltdown. Even foods I know I enjoy can become foods that make me feel icky and stressed >

I hate eating at others as well. I don't have a massive appetite and am pretty picky.  I always feel obligated to over eat, and force myself to pretend I enjoy food I'd rather not have. >

I’ll literally gag if I try to eat something I don’t like. I can’t even pretend to like it. >

I’m the same way. I cannot stomach eating something I don’t like. >

I kind of feel more worried about higiene in certain restaurants/bars. The kitchen at other people's home is accessible to me, the others are not.. >

I've seen some horrible shit happen in restaurants kitchens. Never eating in restaurants again. >

You're never eating in a restaurant again!? Lol yeaaah right >

Yeah, I don't feel the desire after having worked in one. I don't understand what's so unbelievable. >

I totally agree, i absolutely abhor eating with other people; especially at their house, but at restaurants as well; also parties, events, gatherings. I cant pinpoint exactly why, but it just makes me incredibly uncomfortable and i always eat very little, only enough so i have food on my plate >

I have celiac disease and am genuinely paranoid when it comes to eating at other people's homes. I mean, different reason obviously but I feel ya. >

I understand completely. I make sure to know of any food allergies because I have them myself. Even food restrictions for preference or religious reasons. I show my guests the ingredients before hand to be sure it is ok and ask if how I cook them will be ok. I am paranoid like you as well. I have to be, my life depends on it. I treat my guests as if their life does as well. Considering how many vegan and vegetarian friends my kids have, I am considering buying some cookware only for them so no meat or dairy is ever cooked in the same pan. >

Yeah I'm the same. Having food allergies has made me a lot more considerate. I actually refuse to cook for our friend with peanut allergies because I'm so paranoid about cross contamination as we cook with peanuts regularly. >

Good on you! Sorry you have food allergies. It sucks big time! My friend's child was severely allergic to peanuts before my own allergy came to be, so I was on this ship before my own issues arose. That said, it is so considerate of you!! Your friend must be so happy you are thinking of their well-being!!! I know I would. Kudos to you... (ironically, kudos is a candy I can't eat anymore due to my allergy...hel I am old, are they made anymore? ).
Cross contamination is what ended me in the ER....large banquet facility that knew my allergy, but served my tea on the same tray as my deadly allergen. Lesson learned for me. Paranoid af anywhere without good allergy controls for cross contamination. Props to you for looking out for your friend.
For you, I do let my guests know that peanut butter is in my household. However, my baking sheets and cookware never touch peanut butter, but I do disclose it is in my home. I would suggest letting your friends know and let them make the choice depending upon how allerggic they are. I feel, this puts control in their court as to the level of concern, but you sound like a good person that cares no matter what, like me. 
In some instances, I feel more comfortable in my own home to cook for friends than to eat out. Example: For my one friend, has a severe yeast allergy. Yeast is in so many things. I finally found a broth at Costco that is yeast free! Please excuse my excitement. Before, I made broth from scratch from only meat or vegetables that never, to my knowledge, were in contact with yeast...check lables, because some manufacturers add yeast to spices. 
Also if you subscribe to food box delivery, let your friends know. I cannot remember which food box delivery it was, I think ugly fruit and vegetables (idk) but they couldn't guarantee no nuts in a delivery box, super nice, responsive and very honest so I am not on their subscription, but I greatly appreciate thier business model.