I feel like me and my twin are growing apart

Me and my twin sister have always been attached at the hip, closer then close, always together, liked all the same stuff. Practically the same person. But recently..we have been distancing. It's senior year but we have 0 classes together, diffrent lunch times and our classes are in separate buildings so I never see her. Plus neither of us have ever had friends we've always been the chubby dorks together but she got a whole pack of friends that she hung out with all summer and everyday after school so I never see her then either and we both have jobs. Then when we are home together our interests are also becoming diffrent I am getting really into K-pop and stuff which she hates and she is really into MCR and like fall out boy and stuff idk....I feel scared to be alone. I always knew one day we would grow apart a little and one day move apart but I sob thinking about that day. I am so so scared to be without her and scared at the thought we are becoming distant now. Idk I just don't know what to do