First of all, welcome to the forums.
I'll answer your questions in reversed order.
2) Yes.
1) Focus on finding the balance between the three.
And, I hate to say that, but you might have to sacrifice WoW to get the social life working. You are a young man and it is usual for a young man to have videogames as a hobby most of his life. At your age childhood and adolescence take up a huge portion of your life. However, it is not the reason to keep it this way.
Also I've noticed that you wrote:"solid professional career which can give me confidence for a happier and more fullfilling social life?".
This is a pretty dangerous belief. I don't think that a career can do much for a happier and fulfilling social life. What if you don't have a career at all?
No social life then?
If anything, good social connections can lead to career advancements. It does not work the other way around.