I’M SO SCARED PLEASE HELP

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I’m pretty sure I’m not doing anything wrong but I just feel like I am. I have clothes on when I do it and i mean I used to do it a lot when i was 8 ( I didn’t know what it was lol) and now I do it twice a week or so and then I kinda forget about it for a few months and get back into it. But basically I feel like my private areas are weak or something idk it may just be me being paranoid. CAN SOMETHING BE WRONG WITH ME? HAVE I MESSED UP MY BODY? I’m sorry I’m 13 and I’m just so scared. I don’t lubricate or use a toy or anything like that