How to make a tattoo by myself.
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YOU'RE Not, it's that simple.

Do you realise the training and equipment that goes into this art form ?
At 13 you are underage anyway.

Hmm? You can't "make" a tattoo, and chances are if you wanted to tattoo yourself (im assuming you don't have any experience with doing body art on people) it won't work! Full stop! You need to get it professionally done! :)