Not sure exactly what you mean by own body. However, under the law children generally do not have a right to their own choices and are expected to be controlled by their parents (really look at the stutes around this stuff and you might be surprised). After all, parents are held responsible for their child's actions under the law.
https://www.ohchr.org/en/instruments-mechanisms/instruments/...
You have stated an unfortunate fact while hiding your value judgement. Do you think the laws you reference are correct, or no?
Do you understand the difference between having a responsibility to prevent your child from law-breaking and having absolute control over their life in general?
If you have children, or plan to, do you want to control every action they take to protect yourself from hypothetical legal consequence? Do you think you have the right to do so? Do you think you should be able to control what they think and express as well?
These questions are not hypothetical, as an answer in the affirmative is precisely what creates the type of abuse I described above.
"my parents are/were abusive" is something a plurality of people (and especially those raised in evangelical churches) experience.
Within that dynamic, the 'value' at issue here is 'Do I, your child, have a right to my own body and choices?'; Too often, the reply to that is 'no, we expect obedience and obeisance to God, your father, and your mother, in that exact order, because that is the one true way'.
This is a form of domination, not well-meaning 'protection'. It does, in fact, 'mess people up', in their intimate relationships most of all.