Honestly, you are entitled to everything you spent your own money on. The US government doesn't recognize this, but what's yours is yours.
Go on and call me an anarchist now if you want. I can't say I blame the government for not giving kids the same rights as adults, it makes a lot of sense if you look at it the right way, but I value moral entitlement to your own possessions above the law.
Despite this, your parents are still permitted to take your stuff.
My point: Don't just sit around and do nothing about this just because your dad is legally allowed to take something that's yours.