How do I say this is mine?

1. Where we can use mine?
2. What is the difference between mine and my own?

Where we can use mine?

mine pronoun use

Mine is the first person singular possessive pronoun. A speaker or writer uses mine to refer to something that belongs or relates to himself or herself. Her right hand is inches from mine. That wasn't his fault, it was mine.

What is the difference between mine and my own?

'Mine' and 'my own' mean the same thing and both show possessions but we use them differently in a sentence. 'Mine' is not followed by another noun and always stands alone. 'My own' is usually followed by a noun (but it can also stand alone).