is it possible for someone somewhere else to be looking at

my computer screen and be controlling it?? cos thats whats happening to me in my world of warcraft

some other guy is talking out of my character and im like wtf?!?

There are plenty of softwares which allow you to do that.

One that's normally and commonly found in schools would be the infamous "red spider"

oops

u have security issue if someone other than u able to control ur computer

If you are one of those who likes to hack games, I don't find it uncommon...