What have you been doing with the phone? What are you allowing to sync and how often? Are you in good signal or weak? All of these things make a difference, and without more information we can't really advise. If it's spent the whole time sitting in your pocket then there's something wrong with your setup, whereas if you've spent a couple of hours gaming or watching movies with the brightness up high then that may well be perfectly normal.
I'd suggest installing GSam Battery Monitor, letting the phone run for a day and then see what is actually using the power. That will help identify what you can do to improve it.
