confused about the future

As, we are getting ready to meet with our advisors this week and set up classes for next semester,it finally hit me that i have no idea what i want to do with my life at all. Right now my major is nursing,but im not doing so well in chemistry so that has kind of discouraged me and made me wonder if nursing is really what im supposed to do with my life..its very stressful for me not to know what is going to happen. I havent really thought about any other possible majors but nursing because that is the only thing i have really ever wanted to do. I thought about being a nutritionist and i even thought about psychology for a while but nothing really seems to fit. I dont know what im truly good at and it bothers me. I have this fear that i am not going to do well enough in college and there going to kick me out and ill have to flip burgers as a living. I know that everyone says when your a freshman you dont really have to know what you want to do yet because it is all basics anyways.It still freaks me out though and i really wish i could figure out something that matches my personality well and that i can enjoy doing, and do it well.