By "u", I assume that you are referring to a person with the last name of "u". Since I do not know any such person, I assume you are referring to a person with a last name of "yu", since "y" and "u" are close together on a computer keyboard. The only such person I know is Glenn Yu, whose ethnicity is Asian.
I spent more than 5 raw fish and I still couldn't tame an ocelot.
Try downloading the gun mod; historically, it has proven itself to be very successful when dealing with mobs. I hear that it has recently been updated so that when you point any sort of implement at a mob, a list of options will pop up by which you can coerce the mob into doing any action you wish at gunpoint.