PS: If you are in Year 13 you would now have to wait until next year to apply to Oxford or Cambridge, but you could still at this stage apply to UCL, KCL, LSE, QMUH, and SOAS in London, or to Reading, RHUL, Essex, and other universities near London. For the first three you would need to take the LNAT. If you live north of London then Warwick and Nottingham aren't all that far away.
I was the second in my family to go to a university (a year after my brother). Education changed my World and that of my parents. Please try to persuade your parents to see that the horizon is wider than they may presently think it is.