To be honest, I wish I could be more like you. I don't feel alive but fear prevents me from living. Ca...
I think fight response would be the right way to see it. I do remember freezing the first time I got in a fight at night and I just crouched in a corner, and got beat up until the muggers realised I had nothing valuable to steal. I couldn't bear living in fear of being raped like my mum taught me, so I kept going out and getting into fights until I could defend myself somewhat, and the freeze response was trained out of me. Eventually I lived for these adrenaline fueled moments. I don't think this is healthy or something to be desired though.
I do feel fear though, especially after one bad fall off a galloping horse where I should've died. I broke a few bones and had severe concussion, memory loss as well as nerve damage. It was hard to get back on a year later, because like you I went through the consequences in my mind. I couldn't live without that adrenaline rush though, so I forced myself to get back on. I was shaking and scared that ride, and I actually did fall off that day and got a concussion again. I think getting on again and again, and starting to feel in control of the horse with time helped me get over my fears. I think the benefits start outweighing the risks, and especially after so many times where I probably should have died and I didn't, I start to feel invincible, even though in the back of my mind I know I'm not and these things will probably kill me someday. It's like I'm deluding myself.
I really don't recommend getting stuck in a loop of seeking adrenaline though, but learning to step out of your safe zone would be great. Maybe pick an activity or something that you like and get into it little by little, even if, for example, it's as simple as getting on the bike and getting off straight away. I didn't start out on the extreme bike trails, I got there bit by bit as the easier trails started to feel less dangerous, because I rode them and nothing bad happened to me. I don't really understand the freeze response though, so I don't know if that could help you.
I know it's not everyone's cup of tea, but if you like animals and could have access to them, then horses are amazing for recovery and getting over fear. Especially since if you can simply get yourself to get on, it doesn't even matter if you freeze or not because they will keep walking and tug you back to the present. I don't know, I've found it incredibly therapeutic as they force you to focus on them and not your trauma for a while.