Where can I store personal pictures for myself on an iphone?

I want to lose weight and take before and after pictures of myself. I have an iPhone and don't want to store my pictures in the Camera Roll because my nosy friends grab my phone all the time and look at my albums. It would be very embarrassing if they see my stomach or fat legs. Is there an app or option to store private photos? Especially if you need a password to see them?

Why store them on your phone at all?
Upload them to your computer. They will be safe there and only you can see them.
Then delete the off your phone.

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