Well, that's debatable to say the least. There are plenty of examples of people who seem to have no survival instinct whatever. People who commit suicide, who are keen on extreme sports, who drive too fast or take unfamiliar drugs. Or for that matter refuse to follow basic safety measures in a pandemic.
People die every day because they give little thought to survival and simply do what they feel like doing.
I wouldn't say I have much of a survival instinct. What I have is more a problem-avoidance instinct. I don't want to do anything that might jeopardise my physical or mental health and make my life a problem for myself and other people around me. I don't want to become a burden or a nuisance or an object of pity.
Not that any possible survival instinct has ever been seriously tested. I've never been trapped in a burning house, kept prisoner in a locked basement or been stranded on a mountain top. I've never had to survive more than busy main roads or too much alcohol or gnawing hunger.
Mind you, the survival instinct isn't just about physical survival. It can also mean mental and emotional survival. Can you survive abusive parents or an aggressive boss or a domineering spouse without crumbling psychologically?
I've survived in that sense several times in my life. So maybe I have a survival instinct of sorts, just not the one people normally think of.
I've been lucky enough never to lose my mind.