I think that’s so sad that your parents aren’t supporting you, and I’m sorry about that. I think the best way to handle that is to try and prove them wrong. As I’ve said to others with this issue, it’s only you who knows your true capabilities. Don’t let anyone else try and dictate what’s good for you - as cheesy as it sounds, you shouldn’t let people get in the way of your dream.
And of course you don’t have to want to do it from a young age! To be honest, when people go on about having wanted to do medicine since they were 4 it just makes me roll my eyes a bit on the inside. No one really knows what they want to be when they’re that young, you don’t even understand the world yet, let alone know about job opportunities!
A guy in my year at medical school is 30 - he loved economics and studied that at university, then he got a job in business for years… then he completely changed his mind and applied to medical school! There’s nothing wrong with that! If you want to do medicine then go for it! x