Personally I find it pretty neat that as megafauna we are host to entire little ecosystems. It's a calming thought to imagine yourself like some large tree, home to little families of various creatures, bacterial and fungal colonies growing on you. We are thoroughly integrated into the ecosystems in which we live.
They're not harmful, they're just living their mitey little life.
I, personally, am wholly against most of my DNA existing solely it can replicate itself. So what if getting rid of it is more effort than keeping it? I want it gone from my body. Goddamn freeloaders...
I hope you're just acting the fool because of tumblr brain. You aren't being harmed, knowledge of something that wasn't hurting you being uncomfortable should convince you your attitudes are wrong. Not that the situation is bad.