According to Osho, your fear of being an isolated 'I' is a mental construct, not a lived truth. On the real path, ‘we’ falls away and, finally, even the ‘I’ dissolves; then aloneness is spacious and beautiful, not painful. Don’t argue in the head—enter experience: drop the crowd of memories, serve, wait, and let the ego fade. When you are not, existence receives you.
It’s only a scary idea—when you actually walk the path, both ‘we’ and even the little ‘me’ disappear, and what’s left feels warm and peaceful, not lonely.