Sometimes I am a lonely person and I struggle by my own.
This is an understandable error since there are other, similar phrases, and it’s likely that the writer has got them muddled up. The following phrases are possible:
- I live alone in a one-room apartment.
- I live on my own now that my cat has died.
- I live by myself in a hut on the beach.
The good news is that all three phrases can be used more or less interchangeably, without having to worry to much about context or collocation.
Best of luck with your lonely struggling!