Would it be wrong on my end if I did what I wanted to do and dyed my hair and got a tattoo?

So once I turn 18 I want to be able to dye my hair and maybe get a tattoo. Although my parents have made it clear that they will not help me out with college and possibly disown me if I go through with doing these things. They have said I would look ugly if I dyed my hair and that I would be trashy if I got a tattoo.
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