Why are GAS FEES so crazy high?

I just joined and was converting some ETH but noticed that my GAS fees were close to 50% of what I was purchasing. WTF is that all about?

Then I saw that you could click on a “ten minute” thing but it would not let me choose that option. I can look at it…but I can’t choose it.

Can anybody shed some light on this for me?

Thanks, John Santo