Medicine or English Literature at university?

I'm 17 years old and just started my A2 studies. Throughout year 12 I was certain that medicine was what I wanted to do and everything I did was geared towards doing it - I did hospital experience in England and in Turkey, shadowing consultants and watching surgeries; I volunteered at a care home; I've done presentations in primary schools about the importance of healthy eating and exercise; I've volunteered in a charity shop, etc. I am also a leader of Medical Society at my school.

I really wanted to study it with all my heart up until now when it's time to actually apply, and I'm starting to have major doubts: that I won't be able to cope with the immense workload of medicine; that the length of time to qualify is just too much; that I'm not going to understand anything and I'll always be stressed and that I'll have no time to go out/socialise.

On the other hand, I have always loved English Literature and am quite good at it, e.g. I got full marks on my coursework, an A at AS, etc. I'm beginning to think that this might be more suited for me, that I would relish in being surrounded by books and poems and creative people.

But I feel an urge inside me for medicine. I really am fascinated with the body, how it works and what could go wrong, how to fix it, doing my best to help others. It is like an art to me. There's just something holding me back, and I think it's the thought of losing English Literature, which is one of my passions.

Please help. Does anyone have any advice or words of wisdom?
Sorry it's so long