I must say your situation is similar to mine. My mom also left my dad once my brother started earning. For three years my brother took care of our expenses till he got married and then you know.. Situation turned out much worse. After his marriage he couldn't support us anymore and at some point we had to stay humble and later on my mom choose various way to earn money, then someone helped her with trading and she learned trade.
Now I am 24, have a job, can say I can support my mom. So you must know that having a man or father is not everything. You should move on and use all the way you can earn money, help your mom recover, yes some pain can't be forgiven or forgotten, but you have to live till then to see the person die painfully, also forget the past moments and create new memories.
When I say I never regret past, yes I never. I was 11 years old when I understood my mom will die if she lived with my dad who tortured her both physically and mentally. When I was 13, I forced my mom to left dad. I didn't want a family. I want my mom to live. By helping her live, now I am living otherwise I don't think I would be alive till now without her support.
So dear don't loose hope, just move on., there are plenty of ways to earn money. Use any. Don't think about Soceity they won't feed you. Take care of your mental health also physical health. If it's too much to take care of such dad or if he still wants to disturb your life then do take action against him in a way which will be the best evidence of self defense.