I had a bad leg sprain on 4 jan and it still hurts! i got bored of painkillers... is it normal to still hurt?

No: Who diagnosed you with a bad leg sprain? A sprain of a ligament can vary from a simple strain to a complete tear. A sprained leg, that does not make sense. Did you sprain your ankle? Was it your knee? Whichever area it is, if it was a sprain and was treated properly, it should have been healed by now. My advice is to seek medical treatment/evaluation ASAP.

No: A sprain, even if it was "bad" as you say really should better by now. It suggests there may be something else going on. You may need a repeat evaluation and further testing, including possibly an MRI if you have not already had one.