weird thing ...

Every time my mother comes in my room or approach me from behind or any one i jump or get startle easy each time.... I do not know why im at the pc relaxing some one come from behind aaaaha!!!!
WTF you trying give me a hearth attack!!?!?! no ok ya whats up .... Wish i knew what cause it maybe i do not hear them ?? Also i cannot recognize voice on phone sometimes hate this