re: How should I handle this situation figuring out my Dad used my birth money?

Just tell him that you need the money that you're ENTITLED to in order to EMPOWER yourself within a SAFE SPACE, and so that you can deal with the PATRIARCHAL BULLYING and MICRO AGGRESSIONS that PRIVILEGED people have using to OPPRESS and OFFEND you.

Please let us know how this pans out. By the way, does your dad have violent tendencies? Hopefully he does.