Phobia of death and bad things happening

Anyone have this like you plan your fate and you always think your dying or if someone tells you someone has passed away you automatically think your next. I see everything as signs and I read into things to much. Sometimes it's so real in my head that I'm stuck in my thoughts.

How do I overcome this? It's been 10 years I seem to think no one will understand. I have a good life but whenever I try to be happy it all comes crumbling down I feel like I prevent my own happiness because I'm constantly stuck in my head. I can differentiate between is this real or is it all in my head. Will really love some advice on this very sensitive topic.

Thank you in advance.