I'm not sure I want to do history at university anymore

I'll keep this as short as possible.

I've never known what I wanted to do for a career and I've never felt very passionate about any subject, but my favourite has always been history and it is my best subject. I took history, English lit and philosophy at A Level and did very well. However, because I was unsure about what to do at uni during sixth form, I took a gap year and applied post results. I chose to do history and accepted an unconditional offer from KCL and that's the position I'm in now.

But I'm having serious doubts. I admit, I've been scared by threads on here discussing how useless (compared to stem at least) history degrees and so on are and as I still have no career plans, and most of the destinations for history graduates don't interest me except maybe teaching or media (unlikely though), I think I'm going to be wasting my money and time.

I wish I had taken science a levels but when choosing my A levels, some supply chemistry teacher told me that science wasn't my strength and that I shouldn't do them at A Level, and stupidly I didn't even question them.

I have an interest in health care, but I don't know whether I'm cut out to be a nurse or anything like that. I'm a shy and easily stressed person with mental health issues and I have no confidence. I just can't stand the thought of being in some kind of corporate desk job - I want a career that seems worthwhile.

I don't know whether to just go to study history this September or seriously consider doing some kind of access to science course. The thing is, I know I enjoy history and I'm worried I just like the idea of doing science as opposed to the reality.

I'm so stuck and feel like I'm running out of time. I've already taken a gap year so I can't really take another to do an access course (in fact, because I have no work experience or anything it'd be 2 years at least before I started an undergraduate degree) and there's always the chance I wouldn't like it and then where would I be?

Any advice or insight is much appreciated.