Why is 6GB ram being used with barely anything going on?

So I'm looking at my Activity Monitor for the first time since I got the late 2013 Macbook Pro.

To my amazement it's showing 6GB being used or 75% of my 8GB?!

But looking at the activity monitor is showing that the highest ram use is Kernel Monitor at 600MB.

After that it's com.apple.ServiceAgent @ 170MB and Google Chrome at 140MB.

Than there are like 15 "Google Chrome Helpers" ranging from like 100-30MB. What in the world is "Google Chrome Helpers" this seems like some kind of operating system bug to me...

I have about 13 Google Chrome tabs open but even more Helpers than tabs in the Activity Monitor...

There's no way a small Google Chrome session should take up well over 1gb ram?!

Even still, if I estimate all the Memory usage displayed in my Activity monitor it should be low 2GB, defenitely less than 3GB.

So why is it saying 6GB in use? The MAC OS couldn't possibly be 3 GB right???

This is crazy and I've noticed my MAC is pretty sluggish today while I'm trying to work. What in the world is going on here?

Can I manually cancel all those " Google Chrome Helpers" for starters?

On Windows 7 I could have literally 100's of internet tabs open and see less than 6GB ram useage no joke! Need help here please.