I Scare People Unintentionally

I'm new to this site, but I would like to know what's happening.

For a few years now, I've been really sensitive about some things.

On a certain day in February, every year for a long time, I would break down sobbing, and be angsty all day. I asked my parents about it two years ago, and it turns out that that was the day that my brother died. My mother had a miscarraige four years before I was born. I feel no attachment or grief towards John (the name my parents had been planning on naming him with) except on this day in February.

In a slightly different situation, I feel people moving through my house. I just know where my parents and occasionally three sisters are, and have an idea of what they're doing, even if they're silent in doing it.

For instance, I draw a lot. I make a little nest in a room (never my own room, for some reason), put on headphones and play some bass - really loud bass. I also face away from any entrances to the room. I then immerse myself in my drawings; always angels, devils, unnatural beings of some form or another. If someone were to enter the room, it would be, theoretically, impossible for me to know they had. Yet I still feel them there and I turn around, scaring the bajeezus out of them. Consequently, people attempting to sneak up on me anywhere, be it in school, at home or otherwise, will fail miserably. It's like I feel the energy shift or something. Actually the best way to describe it would be that I "sense a disturbance in the Force". Bit weird, but fellow geeks will understand.

It doesn't bother me that I know everything that's happening in the house; I often joke to my best friend (she knows everything) that if we ever got burgled or attacked or anything, I would be standing by the front door with a light saber, ready and waiting.

I would simply like to know if anyone else feels this; and since my brother never technically lived, I couldn't be feeling a past life or anything - so what, then? And is there a way I could develop my "powers" to do more than scare people?