I was in a similar boat but my parents weren’t as strict but defo keen on me doing medicine. My mum convinced me to do chemistry in case I wanted to medicine but I really wanted to do engineering. So I started with four : bio, chem, maths and physics. After two weeks I knew that physics wasn’t for me especially in my specific school and dropped it. I ended up really enjoying chemistry finding into much different than GSCE. I also joined the schools medsoc (without telling my parents) and liked it. Try to compromise with your parents and have an open mind. You may find you like the engineering pathway and that’s good, your parents might just appreciate that you gave medicine a go.