Unless your room transends the normal bedroom, its not epic, for example if you had a glass floor with a huge fish tank underneath full of exotic fish, that would be EPIC!, if you just got new curtains, its not epic, its nice.

If your friend did something amazing,out of the ordinary,something massive, then you could say your so epic right now, if they did something really stupid it could be classed as an epic fail....

Try using the word associated with events that are a big deal.