How to tame my turtle?

So just recently I bought an African Sideneck Turtle from my local pet store and no matter what I do he will always cower away inside of his shell. Same goes for my smaller turtle I found in the pond by our house. I've tried putting them down on the same table and offering them lettuce and dried shrimp but they... show more So just recently I bought an African Sideneck Turtle from my local pet store and no matter what I do he will always cower away inside of his shell. Same goes for my smaller turtle I found in the pond by our house. I've tried putting them down on the same table and offering them lettuce and dried shrimp but they won't take it as a peace offering and just hide inside of their shell. Neither of them bite but I can't tame them. Help
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