Hi Rebecca, you're not being stupid and the fact that you're asking for opinions is good. It shows that you are adult enough to care about your life and people in it.
I guess a lot depends on why you're not talking to your sister, dad and aunt and whoose choice that was/is. I reckon you should write down how you feel about each member of your family, not only now but in the past. This will help you realise what, if anything, you may be missing out from in your future life. If you live in London or Austrailia, yoiu can still have a family relationship. YOU need your family and your family need you, I put money on it.
DON'T give up on your family, I'm sure they haven't given up on you.
Be lucky Rebecca, love and be loved.
Regards, Den. (a father of 3 girls, 19, 23 and 25)