Update: I told my dad I want to be Muslim, and he's okay with it!
I just called my dad and told him, and he said it's fine for me to read the Quran, wear hijab, and pray with him every day. So now I'm about to get my first hijab! I'm so excited! Alhamdulillah, thank you all so much. I still need to tell my mom, but that might wait for now.