Take one day at a time and concentrate on doing what's best for you instead of trying to fix other people. You need to take care of yourself first.

But what if i dont even know whats wrong with me. I just feel sad and empty and homesick, thats the only way i can describe it. And i dont know how to fix that

I too feel sad and empty but for other reasons. But if there is one thing I have learned, please take care of yourself and don't worry about anyone else for now. My best friend is an alcoholic and I tried to help her so many times before I had nothing left to give to her. I had to give to me. I'm not even friends with her anymore because she'll try to drain my energy again and I will not let that happen.

I have two mentally and physically disabled parents that I love unconditionally. However, I like them conditionally. Don't go down this road. Point your friend in the right direction , help her make the phone calls if she needs it and you want to. she needs to get that help but if she doesn't take advantage and she doesn't make the efforts to get better, get out of there. People sometimes say they want to be saved but they don't. I don't know if your friend is one of those people or if she really is somebody who wants to be saved and can be . Either way, it's not your responsibility and you don't have the skills to help her. What you can do is help to make phone calls to doctors, support groups, and whatever other resources are available. If she doesn't go and get the help and just returns back to doing drugs and asking you to help her , you need to leave the situation. You will get sucked into it and it will go on for years if you let it. I don't have much choice in my matter. I am disabled right now and I have to live with my parents . Trust me when I say it's not by choice. You have choices and you should use them . Point your friend in the right direction and help her but not to the point where you are drained. Pay attention to whether or not she is actually making efforts to getting help . If she is making no efforts , let it go. As to how you were feeling empty and homesick, that feeling is pretty normal for somebody who's going away to college . Is it depression mixed with homesickness? I don't know. It's possible. The best way to find out is to talk to a therapist and the therapist will help you find out how to determine what you need. You can also tell the therapist what's going on with your friend and ask her to provide you with a list of resources to handover to your friend. What your friend does with the resources after that is completely in her court .