Dependence

My relationship w my bf is going well. we are going to be making three years together in just a few months. we have a primarily healthy relationship. however, idk I just got this impending doom feeling. he has friends, a great job, a hobby… if we broke up…. he has those things. I don’t have any of them. I don’t have any friends, my career isn’t started yet cuz im in grad school , and I have no hobbies. I just got this massive fear that id literally have nothing without him. how can I become more independent and find myself more while still in a relationship???? I love him a lot, I just got this fear and it’s scaring me.