The one thing you won't be is alone! You will be in QR housing with all your other flying partners and friends and you will be with lots of people every day. You will be so people-inundated that you will be begging for a bit of solitude now and then!
If you were with a carrier in the US you'd be making the same amount of basic salary but you'd be paying for your own housing and all other expenses. Therefore I'd say that with housing, food and utilities provided, almost $20,000 US a year is pretty darn good! I'd say go for it, it will be really hard and frustrating work, but you'll kick yourself five years from now if you don't. I had a friend who cried every day her first six months as a flight attendant and she will have 20 years flying soon.
Mandi