Self isolating and I can't seem to stop

I'm incredibly lonely but my social anxiety and the fact that I have absolutely nothing to offer anyone holds me back from even trying to socialize. I've reverted to how I felt during one of the worst periods in my life- my teen years. All I do is work, come home, and lie in bed escaping into a book. I don't have the energy for anything else. I feel myself pulling away from everyone, because it's the closest thing to unaliving myself for now.