I want to make a girl cry
Is there a particular reason why you want to make a girl cry?
I want to have power over her.
I think it is very wrong to try to make people cry just to establish your control over them. It is an abusive behavior, it might land you in a lot of trouble and if people learn about it they will not like you anymore. You should try focusing on some more positive things to do, or find a new hobby.
(I don't think you understand how the world works.).
That doesn't mean you shoudl make some cry to have control over them. You are going to have a hard time making meaningful relationships if this is how you act.