I don't think it's a poor choice at all!
Initially, I was set on doing Acc & Finance at university thinking that with such a vocational degree, I'm bound to get a well-paying job at an accounting firm.
But after much thought, I realised that I won't learn as much if I did A&F, whereas if I do History, I'll gain so much knowledge about the social structure today and etc (I'm really excited to learn more about this world we live and how it came about!)
I decided to choose to study History because the skills I gain from it are invaluable. With so many articles posted on social media today, it's so difficult to decide on which stance to take and what to believe in. When studying history, I'm always questioned for more evidence to support my arguments; so ultimately, with a history degree, I won't simply believe in random articles and blindly follow what everyone thinks, I'll question articles and ensure whatever I'm reading is the truth. So in a way, studying history helps you think on your own feet and come up with your own opinions though they may differ from others.
As for career prospects, i've worried about this too, but I thought about it, and realistically, I think journalism would be best for me. But i've got bigger dreams as well: to work for the UNESCO! Don't worry too much about it now, with the skills you gain, I'm sure there are a wide range of jobs you can take on later.
But right now, don't regret the decision you've made and just go for it! I'm scared as heck, but i'm sure we'll all do fine!
We're about to embark on a very exciting journey to the past.(haha) Stay positive!! (btw i've gotten an offer from Warwick as well, but I don't think it'll be my firm!)
p/s:Just because you're not a science student, it doesn't mean you're not brilliant!