We have a largish mortgage, 2 children who haven't yet finished their education and at least one of them will need some help through university, no pensions to speak of, a bit of savings (more than £20K) and a business that is providing enough for us to live on.
I don't feel insecure tbh. We've had our ups and downs, been made redundant a few times, lived off fresh air when the business was getting off the ground, that sort of thing. Things work out in the end. Having more money wouldn't necessarily make me more secure - money is meant to be spent (within reason) so I tend to think if you have more incoming you have more outgoing and, with it, the need to have even more money.
Security is a state of mind I think. It sort of depends if you are a glass full or half empty sort of person. From a personal point of view we had very little growing up. So long as I had more than I had then, I don't feel disadvantaged. I personally don't feel the need to stash huge amounts of cash away although I understand why some people do.
Actually security to me is the ability to make money if you need it. That doesn't mean paying off the mortgage, that means being able to comfortably keep up with the repayments. We've got that so I feel OK about it.