Consider these options:
Move out to somewhere far from university and city for cheaper accommodation and take the bus/train.
Use your maintenance loan to pay for the rent, if you can't afford it - get into a house share in the place you want rather than getting your own flat.
Replace your hobby with a job to support your GF. Consider breaking up with the GF if you realise your hobby is more important than her.
Look at charities and grant organisations that provide financial support/loans for victims of abusive parents or better yet go to your university advice office.
Your purpose of this post looks as if you want someone to hand you money to support your ideal lifestyle seeing how "victimised" you are, and are acting in this thread. Abandon that hope and get real.. Everyone tries to see themselves as a victim in their story but the world doesn't care about you or owe you anything. Learn to take care of yourself, you're an adult.