What trouble can i get in havin a tattoo under age?

im 15 and am getting a tattoo
iv had an appointment with my tattooist and chosen the design
he thinks im 18
what trouble can i get in if im caught apart from obviousley my parents killing me lol
mimi xxx
Update: ****edit*****
if i got caught i would not say who did the tattoo cause that would be harsh.
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