I think I have an entity haunting my house.Please help!?

I decided about a year ago to help my mom purchase this really nice older house that had been built in the 1940's. We got information from the owner that a little old lady had this house and raised all of her children in it and that she was very nice. The neighbors surrounding us have lived in this same neighborhood almost all of their lives and have told us how sweet she was. Here is the problem. It seems that in my room, it is the only room that has these paranormal happenings. The first time, I could feel a strong wind blowing out of no where and see a cloudy image while lying in bed. The second time, I was lying in bed and I felt something come down over my right leg on both sides of it, and I turned my body around to see that there was an imprint there as if someone's arms had slammed down over my leg. Today, my mom told me that she was lying in my bed watching my tv while I was out with friends and my eldest sister was here with her. She says she felt someone rubbing her rapidly in her face. My sister says she woke up fighting and asked her did she put her hands in her face. But my sister says she only tapped her on the foot to wake her up. Also, one night I was watching tv and out of the blue (and in the dark) my television cutt off out of nowhere. I got up and tried to turn it back on and it did not work so I looked underneath my desk to notice that it was slightly unplugged (that might have just been coincidence though). I am not afraid of this presence because every time something weird happens I usually just ask God to bless our house. The presence has not yet revealed itself and I am praying that it won't ever lol. I would just be happy if it would just go about its business and I could just forget about all of this. What should I do? P.S. I am burning Sage and praying.