I’m lonely but I don’t care most of the time

I’m 18 and I have severe depression and anxiety. I don’t feel like I’m a person and I can’t ever relate to anyone else, but maybe it’s just because I’m an unremarkable individual. Most of the time I enjoy being alone but sometimes I’m afraid I’m wasting my life by limiting my social interactions. Can anyone else relate to this? I’m not sure what’s wrong with me.