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Because the owner has to pay for and maintain those amenities whether you use them or not. Those amenities are there to attract tenants who wish to part take. You are an outlier in intended clientele.
This already exists...
It's called find a different apartment building with no amenities. >


Well my question is why do we have to pay that extra if we don’t want to use it?

You don't, you rent a similar place in a similar location that doesn't have these amenities and pay a lower rent. 

I think there should be levels of rent giving access to these things so those of us who don’t use them don’t pay for them. Heck they charge more and yet these so called extras aren’t even maintained regularly or even just become unavailable. Yet rent stays the same?

They do this because the amenities become more cost effective when everyone is paying for them. In a large enough building, they charge an extra $100 (as an example) for a pool and weight room but if they only charged the people who wanted them they would cost 2 to 4 times as much. Beyond that, it adds the cost of policing who uses these facilities, which is an expensive headache.