Sounds like your father is still parenting you, and seems like you may have to set some limits with him. If it were me, I would directly state for him to back off and give me some space and room to be an adult and to make my own decisions, but that's just me. I am very blunt and very direct sometimes. But limits do need to be established if you don't want his intrusions and for your buttons to not be pushed.

You could tell him, dad look, I got this. I am fine, I can take care of myself, I can make my own decisions and I can look after my own money and spend it as I choose to or not. Please let me be an adult now. Something like that. (((Hugs))))