I more or less agree with you. But just for the sake of the exercise:

They can't vote.

I'd let them vote. It isn't going to make the decision making process all that much less rational.

They can't sign contracts.

An interesting one. I'd almost appreciate paternalism on that one. Contracts are more useful for the party with the power to see them enforced.

They can't serve on a jury.

Innocent until the jury finds out they're missing the Simpsons by dragging things out! (Just how different is that to current practice?)

They are restricted in the ways they can earn an income. Even if they do earn an income, it is rarely enough to be self-sufficient

Being incapable of producing significant economic value isn't 'oppression'. The obligation of parents to support the economically weak is more credibly a violation of liberties here.

The most obvious restriction on the ways children can earn an income, the one cutting the most value from their income earning potential is of course child prostitution prohibitions.

and they have limited ability to control how the money is spent.

Yeah, that sucks.

They can't consent to sexual relations.

That's seriously harsh. Not just the parents but the law deciding when you're allowed to have sex? No surprise that teenager's gain a reputation for rebelliousness.

They can't purchase certain legal substances.

Don't even get me started on the legality of substance purchases. They treat the rest of the population like children and the children even worse!

They can't hold political office.

That would be a pleasant change.

They can't drive cars.

While we're at it, I just read that there is a new law here that children under 8 must be booster seats whenever in the car, for safety purposes. I hope at least that rule stays if the driving age limit is lifted! More seriously, a skill based regulation replacing the age one could be ok.

They can't travel freely, instead needing permission from someone else.

Permission sucks.

They can't direct their own education.

Another pet peeve. I did a postgraduate degree in teaching and have been left with an altogether cynical view of the entire system. I consider the whole thing blatant abuse. I would quite seriously prefer intermittent beatings by my parents.

They can be forced to attend religious services against their will.

School. Religious services. Very little difference from what I can see.

They can't control their own medical treatment, and can be forced to take psychoactive medications against their will.

That one is scary. I don't trust either parents or the pharmaceutical industry to make that sort of judgement.

They can't choose where to live.

Well, 'My House, My Rules' makes a certain amount of sense in this case.

They can have their genitals modified without their consent.

OUCH! That's serious oppression.