Do you feel you have no one?

If you needed to really talk, or had an issue, or needed help irl etc too?

I might need to live alone soon, and my sister who used to always be in my corner, is very ill. She can't help me physically and I feel a burden bringing anything to her because she is in severe awful daily pain. So I have not one person who can ever support me fully. My therapist says I need some support system, to join a group. But people seem so enmeshed in their own lives.
I wish life wasn't so arduous so much of the time.
Do you ever feel that? It feels terrifying facing life alone.