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I am troubled and afraid of pets because of hygiene reasons but almost everyone is telling me I should not consider hygiene as a reason to avoid them and be appaled.

I am a person that loves hygiene. I dislike and avoid physical contact with humans when dirty and/or sweaty. I must shower at least once a day or else I have subconscious trouble sleeping(even if I have not left my house all day). I regurarly bathe twice or thrice. I enjoy the feeling of brushing my teeth even with a 2 minutes timer I activate the tooth-brush twice or thrice. I brush my teeth more than 3 times a day. I floss my teeth even more. I need to change my pajamas every week. My bedsheet, pillowcase, matress-case, my towels(I have 3 of them face,body,thighs), my wash-cloths(3 of them) are washed every 10 days. I use at my 22 of age(I am a young male) baby wipes every time I use the toilet.

How clean are pets by human hygiene and human medicine standards. Can(I just need a moderate possibility of 3% or so, so as to brand them dirty) a human not allergic to them get moderately sick because of contact with their dirt, mud, dust, hair, saliva, tears, sweat, bacteria, archaea, microzoa, parasites, fungi, feces, urine , sebum, mucus? I am obviously not going to play with their secretions or disconsider washing my hands after cleaning their mess, playing with them and/or before eating, brushing my teeth. But I can neither see unicellular organisms(baring fungi colonies, super-organisms) or just lock them unless I am playing with them. They might jump into my bed, lick my face, lie besides me. They do not take baths absolutely every single day. They do not clean themselves up after sh*tting. They have hair that gets dirty. And they do not wear clothes, wash their hands often.

I have had my fair share of health burdens.

I am a cancer patient (Pilomyxoid Astrocytoma in the Pons of the Brainstem, I have right eye extremely blurry vision after scaring of a corneal ulcer due to sterile, exposure,friction ceratitis(corneopathy) because my right lacrimal gland does not produce tears. Right sided absolute cofosis. And paresis or paralysis of several nerves. My left side vision and hearing are not that much affected. I have complex partial epilepsy due to cancer.

To repeat my question.

How clean are pets by human hygiene standards can a human not allergic to them get moderately sick because of contact with their dirt, mud, dust, hair, saliva, tears, sweat, bacteria, archaea, microzoa, parasites, fungi, feces, urine , sebum, mucus?

As a cancer patient, your risk may be higher than another person's due to the possibility of being immunocompromised. I would consult with your doctor to get a better assessment as to the risk. Immunocompromised people can own pets safely, but they must take much more precaution, and therefore such a person might not consider pet ownership to be worth the trouble. For instance, such a person should wash their hands every time they handle the pet, and they should not be the person that cleans up the pet's waste.

In the more general case, there is some risk of cross species infection, but it's fairly low if you take normal levels of precaution as you mentioned: washing hands, especially after handling waste, vaccinations, and so forth. The biggest risk is in handling their waste, which can spread various parasites and bacteria.

I would not recommend pet ownership to someone who is very squicked by uncleanliness as the reality is that pets are messy. You'll very likely touch them without noticing they just licked themselves, they'll sneak up in the kitchen counter with their dirty feet and rears, they'll drool, they'll vomit and have accidents, maybe in the worst places. These types of things will definitely happen if you adopt a pet. So even if it is true that you can live a healthy life with pets if you take the proper precautions, it is perfectly fine to make the judgement that a pet just doesn't fit into your clean lifestyle.

If you had a choice between a cat and a dog, go for the dog as cats that are allowed to roam outside pick up toxoplasmosis which can infect human brains. And the condition is untreatable.

Dogs are man's best friend since we co-evolved with them. Having some germs around is healthy as it challenges our immune systems. An unchallenged immune system leads to immune dysfunction though probably not cancer.

And to forestall any issues make sure the dog is taught bite inhibition, and gets seen by the vet regularly.

I try to answer based on dogs, and in general, not considering possible extra hygiene needs caused by your health situation:

Surprise, surprise, dogs don't "take baths", but it is up to the owners to "help them! [Yes, esp. cats take care of themselves to some extent, though]. "Common sense" works here. I love my dogs "too much", and try to take care of their hygiene, but, while I know many people do, I have never, will never, and do not recommend anyone to:
1. Kiss their pets
2. Eat / prepare food by bare hands after touching the pets, without washing ones hands first

My experience from many vets, who supposedly know better, suggest that I may be exaggerating, though. When getting vaccinations for my dogs, I have seen vets, after having touched the animal, grabbing the "cap" of an injection needle, then putting the cap [with the needle inside it] into his mouth to later allow him to conveniently pull out the needle from the cap using one hand, while holding the animal with the other one.

p.s. If I understood your 1st sentence correctly, someone may be pressuring you to interact with [his/her?] pets. If, so, this is obviously inconsiderate behavior, and I feel bad if you have been exposed to such!