My Dad has ruined my life

My parents would save up but when my dad’s gambling addiction started he gambled all of their savings and took loans out ruining his credit score. Any money my mum had he’d make excuses saying he needed to borrow the money for something and that would be gambled. My mum trusted him at the time. My mum is financially reliant on my dad so feels trapped in the relationship. Sometimes I resent my dad for having 4 children but can’t even give us a decent life and causing my depression. We live in a three bedroom house and can’t buy a larger house in the area because of his poor credit score. My room is so cramped because I share with my sister and I feel like I can’t even improve myself or experiment with makeup or clothes like other girls do because there’s no space to. I do want to move out when I’m old enough but my mum won’t let me saying it’s not safe for girls to live on their own. One of my siblings has severe mental health issues and it just makes me so sad knowing a lot of it has been contributed by my dad. It’s so difficult having no support system when all i hear from their friends is their dad buying them their first cars or even their dad being emotionally present. I just wish we could buy a bigger house but I know those hopes are gone unless we move further up north. I also feel like because of his mistakes there’s more pressure on me to get a good job and provide for them but sometimes I think why should I after he ruined my younger years of life. I feel like all happiness has slowly been sucked out of me and struggle to keep friends because I have no one to talk to about this. We have very well off extended family but none of them come to our house and on Christmas we sit in a house alone. It’s just depressing feeling so isolated all the time and I just know the same extended families would be in contact if we were well off. I  just need help finding my way around coping with this situation.