It's a hard slog if you're studying something you're not keen on, but you might not yet know what really grabs you. So if you're not sure, look at what you're good at and what interests you. (If you're an all-rounder, this is less helpful.) If you're good at STEM subjects, I'd lean towards those, because there are more likely to be more job opportunities. I'd go for something core/more general - if you need to specialise later, there are post grad options.
And don't forget that it's not setting your life path in stone. My first degree is history and now I work in IT. There are a lot of women in IT who started out in totally different fields, and I think it makes a better, more diverse workforce, because you end up with a wider range of skills available. I use the writing and analytical skills gained from my history degree every day, as much as I use the tech knowledge from my computer science degree. You need to look at the wider skills gained, not just details of the 1842 Mines Act or whatever, which I admit doesn't tend to come up in my work life.
If you're determined to be a surgeon or teacher, that will guide your choices. Otherwise, go for something you enjoy, but don't ignore how it will be employable - and you while it will close some paths, there will still be more open than anyone could make the most of in a lifetime, so don't worry too much.