I love my family. The second I hit 18 they immediately turned around, stopped treating me like a child and accepted me as an adult. It was kind of like they went, "Upph… He turned 18. That means he has instantaneously acquired all the knowledge and maturity of an adult. We will now treat him as such." Although to be frank, they were dead wrong. >_>
... Honestly, it feels like it took until this year for me to really come into being an adult. I'm actually making more money now than both of my grandparents combined on their fixed incomes. (I live with them if you need relevance.) And they're looking back in retrospect and thinking that they should have given me the house instead of my aunt (their first child). Although really, I don't think I was even 18 yet so it probably wasn't even plausible.
And I've turned around and actually started taking care of them now. As well as, I'm supposed to be the sole benefactor of my mom's life insurance as well as gaining instant custody of my younger sister if she happens to die, for whatever reason. It feels like, in one fell swoop, I've turned around and become the head of the household. Once I started seeing their dependance on me, that's when I really felt like an adult for the first time.
Was mostly spring-boarding off of trapped's post to make a semi-related confession myself but to add some level of relevance to marimo's post... I heard one time that, "You're an adult once and a child twice".
What this means is that you grow up, being taken cared of by your parents. Then you become an adult and become a parent yourself. And then your kids grow up, turn around and take care of you when they're adults. Your relevance peaks and then it wanes.
I don't know what your father is like marimo, but maybe the problem is that he does see you as an adult now. And maybe it frustrates him that he's soon going to fall back into irrelevance, in terms of being in control. The control is going to shift into your hands and his influence is going to fade away. So he might be giving you extra amounts of hell now while he still has some level of control over you.
Either way, and I know it's frustrating, your time will come. And that time is coming much sooner than you'd think.