Family pressure and stress from poor AS grades

Hello,

This year I took maths, chem, bio and physics and want to go to uni to study EEE or another engineering degree. My parents thought I was going to achieve all A's but I was far from that achieving 2 Bs and 2 Cs with Bs in maths and physics.

The thing is I worked really hard, like two hours every morning before school from January onwards and every night for like three hours. I was predicted all As which made me even more upset as when I met my teachers during results day they were disappointed and angry at how badly I'd done.

I've never really experienced such bad grades as for GCSE I achieved 7A*s and 4As. What's worse is that my sisters both achieved much better grades and are now studying medicine and banking after going to top units with straight As at AS and A2.

They believe I should match them even though I know I worked my hardest and still failed. I'm seriously considering not going to uni and doing an apprenticeship as I'm useless at every subject no matter how hard I try.

What should I do?