Not good enough parenting

[Zoono]

I feel like, I've really messed up. I'm a single parent to a toddler and in general I'm very attentive and protective of dd ( hovering over her in the playground, constant suncream, completely toddler proofed home, never left for a moment alone in bath etc) but today we went swimming just the two of us for the first time. It was an. unfamiliar pool and despite watching my DD constantly and staying close she managed within a few seconds to climb out of the toddler section and tried to walk towards the edge of a much deeper part of the pool, just a couple of feet away. I was only sat a few feet from my DD and quickly started to move towards her. A lifeguard got their first and tbf rightfully reminded me to be aware of how deep the pool can get. Its taken me long to feel comfortable taking my adventurous DD to the pool and now I'm scared to do it again. Aibu to not want to take DD on my own again. I really do feel rubbish and scared after today.

I am usually the first to wade in on a children and water thread and I generally think people aren't vigilant enough around water, but this is what I think - children usually drown not because they fall in the water (unless it is a river or lake where they are swept away), but because no one notices them fall into the water (at least until it is too late). If you are swimming somewhere 'safe' with a lifeguard and you are following your child constantly with your eyes (best to pick the brightest swimsuit you can - bright orange or yellow are great), then yes they might slip away and god forbid fall in before you can reach them and get a shock, but probably that will be all.