Depressed

I have been feeling so low lately and like I’m not even worth it. I have no friends , literally I am being 100% serious when I say that . The past few nights and more nights before I have not been able to sleep I feel sad but I’ve cried so much I just can’t cry anymore and I sit there in the dark just staring. I try to sleep but my heart just feels like it’s going to pop out of my chest and I just don’t feel as tired anymore . I wake up super early now and get a couple of hours of sleep then can’t go back to sleep because of the thoughts I have the night before. I just feel empty sometimes like I have no feelings but the other times I just can’t stop crying and I feel awful. Idk what to do. And I overthink everything and get even more sad and just make up scenarios and I’m sick of it :(