Also, not having your period will actually make tampons a lot harder to use. They will be more difficult to insert, since the blood would help them glide in. Once the tampon is fully inserted, it will also be much more uncomfortable to take out - the dryness of the fibres will 'catch' on the inside of your vagina and make it harder to remove.
Generally, if you're worried about tampons, do some research online. While they can be tricky, there is no need to practice before you actually get your period. You will eventually get the hang of them, and it's kinder to your body to attempt tampons when you actually need them.
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