http://www.worldvision.org/
I fully encourage you to go study in the US. You can get your major there in Qatar, but the experiences you will get in a foreign country, mixing with people with different backgrounds and ways of thinking will be priceless. That's why I, as an American, have loved living in Qatar. I have had experiences most Americans will never have. And I also get to come back to my own country and experience the huge diversity here as well.
I'm a Muslim from the US and I say go for it and wear your hijab proudly and you will have great experiences to bring back to your family and share with your future husband and children and colleagues too! And, why not have one of your family members come with you and live with you here if they are concerned for you? I'm sure you could find someone in your family that would be happy to do that with you!
Pray istikhara and inshallah you will find your answers :)