I think i have a ghost in my house what can i do?

im a very skeptical person and things like this dont really interest me, iv never sen a ghost or really thought they were real until now, i live in a pub an me an my sister were in the upstairs living room, she fell asleep on the sofa an i went to my room, i was sat on the floor looking in the mirror wen i heard the livin room door bang an then my sister jumped up shouting my name, i ignored an thought maybe she woke up from a nightmare, i got in bed an felt something touch my leg an move my covers but i jsut ignored it, the next day my sister came into me an sed... why did u pull the covers off me an sam the door? then she asked me why i took all the pillows off the bed and stacked them up neatly next to the sofa? also my mum ws upstairs a few days later an ther was footsteps in the loft and heard the same door slamming??