...to become really talented, in everything form playing guitar to paint paintings. So, would you consider NOT playing Skyrim, and invest all that time into becoming incredibly skilled at something useful?
I'm afraid that statement is very wrong...you can be talented at something before ever trying it. Some people have a natural aptitude towards certain skills and will need much less practice than others to become good.
Also, if you'd rather spend your time playing games than becoming good at something you don't enjoy as much, why not do it? Will you be a happier person by being able to play the guitar or paint pretty paintings?
Many people think that everything they do has to be useful for it to have any meaning. Well...if it's something that makes you happy...why do anything else? Of course you should work, go to school, help others etc. But as for your own spare time...spend it on things that make you happy and make sense to you, instead of trying to please everyone around you.