Could I Be A Medium? I'm Really Scared

As this year has progressed, more and more crazy things have been happening to me. My house seems to have entities in it, but so does the rest of the world.

I'm not really sure as to weather or not this should be in the Ghost Stories site but how my story progresses is what makes me think its more on the psychic side so please, if I'm wrong, I'm very sorry.

The first encounter in my house was one night when I was talking on the phone with my boyfriend when I heard a very loud and clear knocking on my bedroom door. My first reaction wasn't "well that's definitely paranormal!" It just sounded like a regular knock. One that my mom might have done so she could tell me good night or something. But when I went to my door, all I saw was my moms door open but her standing at the door like she was answering it too. We had the whole "Yes, what did you want?" conversation and when we both confirmed that neither of us was messing with the other and that neither of us knocked we both knew the possibility was there. BUT trying not to jump to conclusions, we tried finding what could have one it. We never found anything that came even close to the sound other than when we knocked on each others doors.

Then the house got progressively worse with what sounded like children running around the house, dishes clanking at 3 in the morning, and a woman sobbing uncontrollably with the sound of her cries coming from all directions of the house.

My Grandmom, who me and my mother live with, decided to have the house blessed and things seemed to go away for a while.

Everything had been doing just fine until one day I had gotten into the shower at around 2:30a.m. When as soon as I was relaxed there was a very loud knocking on the bathroom door followed by a woman screaming at me but in a tone that sounded like she was extremely sad. (You know the whining, broken, high-pitched sound your voice gets when you cry really hard.) I asked her to repeat that, turning off the water because I thought it was my Grandmom. (My mother wasn't home that night.) And all I heard was footsteps slowly walking away. I shrugged it off and went on with my shower.

A few weeks later I was driving on US 19 (If you live in Florida, you may know what I'm talking about. Nasty road, 19 is.) and out of the three lanes, I was in the middle. The sun was just on it's way down so it wasn't pitch black outside but it wasn't fully daylight, either. I saw what looked like a tall man in all black standing in the median. I didn't think much of it because people cross the street all the time, but something caught my eye. He didn't have any features to him. He was just... Completely black. There was a semi truck on my left side, closer to this man, and other misc. Cars on my other side. Then the man decided to just take off into traffic! I immediately slammed on my brakes, thinking I was either going to hit him or witness a death within the next 2 seconds. As soon as he got directly into the middle of the first lane, the semi didn't even slow down, but kept going! I knew he was dead, I just knew that he had been hit. But then as I was stopped in the middle of the road and I looked, the man wasn't there. Not even in pieces. He was just... Gone. Then I came to my senses, shook it off and kept driving.

Now for maybe a week there has been an unnaturally tall man that stands in my doorway and watches me sleep. He doesn't say anything, he doesn't do anything to me, he just stands there and watches me. A couple of nights ago, though, he decided to walk over to my computer chair to sit and watch me. And it used to only be in my room that I knew he was there, but last night when I was taking my shower, I could feel him standing in my bathroom, watching me. It made me feel so uncomfortable that I cut the shower short. But this time, I couldn't see him, I just KNEW he was there. I can't really explain the feeling, it just... Makes me feel awkward.

Those are the bigger things that have happened recently. The smaller things basically consist of me hearing the crying woman walk around sniffling and muttering things that I can't understand, or hearing heavy breathing and knocking. Other places I hardly never hear things, it usually just see little things here and there of people that seem to just disappear.

Is this a form of psychicness, mediumness, or am I just haunted?

It's making me have horrible dreams, or makes it so I can't sleep at all and makes me not want to be alone.

I would love to hear comments or suggestions as to what I should do.