Influence over situations/premonitions?

I am not sure how to formulate this. Ever since I was a little girl I would get feelings, someone could call them premonitions, about situations. And I still do now. For example, I had a feeling that a friend was pregnant before she told anyone. I dreamed the condition my sister was born with, years before my mother ever was pregnant.

Then, I also feel I have influenced situations, by concentrating on them? Like, I was not getting along with a colleague and concentrated on how he would be fired. I visualised it and it happened almost that way. But "influencing" over situations has also backfired. I had an ex boyfriend who I thought had treated me badly and I wrote on a piece of paper that I wanted him to come back to me and lose his mind. That's how I wrote it, which was a mistake. He came back, we were together for a few months and he started having psychotic breaks and was institutionalised. I don't know if it has anything to do with me. Did I influence this outcome? If it is so, I feel I have a responsibility to learn to control this thing that I have, whatever it is? What do you propose I study?

There are many other examples I could give, but I don't want to make this extremely long.