How to get these thoughts out of my head?

One of the bridesmaids in my brother’s wedding (her family are long-time family friends of ours) and I were talking about a month ago. I mentioned that I’d be turning 14 soon, and she mentioned the life-changing car crash that she’d been in 15 days after her fourteenth birthday. She said it’d be interesting to see what happens to me that day. Ever since, I’ve been thinking about how much my life is changing lately. I can’t help but thinking if anything life-changing really will happen on that day. I’m not a superstitious person at all and I’m annoyed at myself for thinking like this. So how am I supposed to get rid of all these thoughts? Is it possible?