Is it normal to overly fear being outside in public (being murdered etc)

So I'm 18 and I used to be fine leaving my house and going places with no anxiety and no fear but I stopped leaving for a while (a few years) and stayed home the huge majority of the time and now that I've gotten older (and seen some pretty messed up shit and stories online) I get crippling fear whenever I see a car coming my way or a person walking towards me (mainly when I go for walks outside) and assume that they want to murder me / or if I want to go, or go to a public place (like walmart, or a mall) I get fear that that place will end up getting shot up

It isn't minor fear it's intense fear if I get a ride somewhere I feel like I'm going to get in a car wreck and die

I assume the worst in every situation outside my home and actually think these scenarios are actually going happen

Example (I was walking with my little brother earlier for some exercise and a car goes slowly behind us and I immediately thought they were most likely going to blast me with a gun and kidnap my brother and freaked out but it turns out they were just confused on where they were going)

Tl:Dr I stopped going outside for a few years and learned how fucked up the world is and turned into a complete pussy and now I fear situations in public

this may not be the staying inside for years part but rather the learning of how dark the world can be