i totally understand the fear, i'd wish i had some reassurance for you that there was anything to help numb that primal survival instinct, but really, it'll always be there, to some extent. it's not really something you beat through sheer force of will, i guess more just an old friend to make peace with before parting ways, if that makes any sense?
but one things for certain, you're not alone in that feeling, it doesn't make you any less-than whatever it is that you truly want, it is just a biochemocal response that i can assure you everyone else here also has, myself included. one thing that's always helped me with my own fears has honestly just been exposure therapy, and while i HIGHLY do not recommend repeated SN exposure to practice controlling that fear, from what i've read between pubmed and bluelight, poppers (amyl-nitrate/nitrite, plus like 300 other pro-drugs, most well known is Rhino Rush) have a near identical effect, albeit only lasting a few seconds, it might be a place to start?