Majority of internet technologies are skewed towards downstream due to technological limitations. DSL & DOCSIS technologies primarily. DOCSIS is based on cable tv networks for example, which initially was designed only for one way data transfer - so upstream was "hacked in" as an afterthought to make internet actually functional. Even though theoritically DOCSIS can offer pretty good upload speeds now with 3.1, it's still rare, and nowhere near symmetrical - it's usually a very large investment for the ISP to make that happen.
With tech like FTTH, ISP's can easily offer symmetrical high speed internet, even 1 gbit down and 1 gbit up and still deliver those speeds majority of the time. Though, keep in mind, even with something like that, you will be sharing bandwith with other people in your area. And, it makes sense that downstream bandwith would be more saturated than upstream - just think of it logically, majority of stuff home users do primarily utilize downloads, not uploads.
So, in short: it's perfectly normal with the kind of beastly internet you have and there is nothing to worry about.
I generally measure higher uploads than downloads too, by 50-100 mbit. It's pretty close now but it's also 5 am here and pretty much all my neighbours are asleep.
