When I was student my teacher told that the sentence, which I quoted above, meant someone made a his(or her) fortune by himself(or herself).I'm better off on my own ♪
But I'd heard of some lyrics sung as 'Better off on my own' by Sum 41 few days ago, and I listened to this song yesterday.
At that time, I thought there was possible My teacher could be wrong.
To me, the quotation means "I'm better from being alone" or "I had better be alone".
I guess that I'm right, but I'm not sure about it. Please tell me the truth or correct me if I'm wrong. Thank you.