Demonic Or Wild Imagination?

This is my first posting on this site; everything I'm going to write is entirely true. I am writing because I want to know if I should be scared or if I should just pass it off as having a wild imagination.

My father and I bought our first house in Kansas after having lived in various apartments. I was in 8th grade at the time. For the first several years nothing happened. No strange noises, no bumps in the night, nothing. It stayed that way until I was a senior in high school (2 years ago) and began dating my current boyfriend. He's a few years older and a strong Christian. I've always considered myself a Christian, though I was certainly going through a wild phase when I was in high school. When he and I started dating my faith became a bit stronger, and I now attend regular women's bible study at a local church. My boyfriend had told me of an experience he had when he had lived in California, touring with the band Nural. Long story short, he saw a woman named Sara Crow in a diner and he believed she was possessed. She rambled somewhat incoherently about aliens and other things, and ate off plates that were left at empty tables. She also talked in different voices, and although she was a woman, looked manly. So, with the back story in place, here is my story.

Senior year, not long after hearing my boyfriends story of Sara Crow (which if anyone has heard this name or knows of a women like this please contact me) He and I had a similar experience together. We were sitting in my driveway talking when a Woman with a black dog came up to the car window gesturing to us. We thought she wanted to walk across the drive way to the other side of the sidewalk, and said to go ahead, we weren't going to be backing out. We soon realized she was deaf, so she continued to gesture wildly. She kept making a motion like kicking in a window, which we couldn't figure out. After a while I was getting really freaked out so my boyfriend called the police. When the woman realized he was on his phone she immediately turned and walked back the way she came, around the corner, and was gone. I never saw her again after that.

Around the same time I started to experience noises or voices in my room. One night I was lying in bed on my side just about to go to sleep when I heard an audible voice say "How are you". I didn't reply, but I did run down the stairs and sleep on the couch. Not long after I was lying in bed again, just about to fall asleep on my side when I heard an audible Growl. My cat was lying behind me, and he perked up as if he had heard it, but didn't seem frightened. And believe me, it was not a growl you would hear from a cat. I again ran to the couch downstairs, and continued to sleep there for months.

In that same year I remember several times hearing my dad's air pump (for tires) turn on by itself for several minutes at a time and then turn off again. It was a loud almost vacuum sounding type thing, so although it was in the garage, I would hear it from my room (which was above the garage) and also the living room, which had a door leading to the garage.

I have since moved into my own apartment and my Dad moved to another city with his new wife. I haven't had any experience since moving. My boyfriend was convinced it was a demon, which I also believe. If this is true, why me and, will it follow me? Should I be worried? I've already fully accepted Christ into my life and pray often.

Please help if you can.

Thank you for reading.