by myself, on my own, myself

[Ju]

I will do it myself = 'I will do it, no-one else will.'
I will do it by myself = 'I will do it, I don't need any help.'
I will do it on my own = 'I will do it, I don't need any help.'

I found the above from a closed thread talking about the differences between the underlined parts.

If that's the case, does it mean by myself and on my own are in the same meaning?

Thank you.

[bhaisahab]

I will do it myself = 'I will do it, no-one else will.'
I will do it by myself = 'I will do it, I don't need any help.'
I will do it on my own = 'I will do it, I don't need any help.'

I found the above from a closed thread talking about the differences between the underlined parts.

If that's the case, does it mean by myself and on my ownhave the same meaning?

Thank you.

Yes.