I would suggest reaching out at school too. Is there a teacher that you particularly trust and get on with? Explain to them that you tried talking to your dad and he didn't understand. They might be able to talk to your dad and explain to him that it's not just a phase or something you can stop like that. You might find the he listens more to them as they are an adult... Sucks but thats sometimes the way it is.

Keep pushing for support, you're doing the right thing. I ignored it for years and am paying for it now.