Struggling with Trauma-Induced Anxiety Around Money

I’ve scrolled through some of the posts under this topic, and I feel bad because my trauma feels less… I guess bad than some others, but I feel like it causes problems in my everyday life and in my relationships. I’m bad with money and don’t understand it, which I think stems from my autism, and I’m very impulsive, which is from my ADHD. When I was younger, like 8, I impulsively spent a lot of money on candy at the corner store. My dad found out and screamed at me, called me all sorts of names, took me back to the corner store and berated me in public as he returned all of the candy. To this day, I have nightmares about him, I get anxious about spending money over $20, I try to avoid interacting with him after I’ve spent any sort of money, and it’s caused some minor problems in my relationship because of the terror and anxiety it causes so I accidentally get angry in those situations. And now I’m going into college, and from what I understand, it’s very expensive and so I’m constantly on edge because I don’t want my dad to scream at me or get angry about how much it costs and take it out on me. I don’t know what to do, money is a part of everyday life, but it causes so much terror and anxiety just to use it.