How do I fix my right joystick to my psvita?

my right joystick to my psvita is stuck and moving in one direction on it own. i tried cleaning it out but it didnt work. its really stressing me out and i cant even play minecraf! how do i fix it? plz halp a little old lady! i give you some hard candy (okok. im not little or old or a lady and i dont have any candy)