pre-departure anxiety

So I'm leaving in 18 hours and I'm not sure how I feel about that. Everyone has been telling me that I don't seem very excited to go, and the truth of the matter is that I'm not. Well I am, but I'm mostly scared and nervous and not very willing to let go of what I have here at home and accept this huge change in my life. I have no idea what to expect, and while I know that it will be a great experience and a lot of fun, I am kind of dreading the consequences of being away for so long, be it bad grades, distanced relationships, etc. But I guess I should focus more on the positive aspects of studying abroad and make the most of it. Winter break has passed way too quickly... wish me luck.