I feel lost and i have no idea on what i want to be in the future

I apologise for the paragraph. I'm in A levels studying Biology, Maths, and Chemistry with no idea on what I want to be in the future. I wanted to be a dentist before but I think I only ever said that for the money, and I think that its out of the question now due to my C in English :smile:

Although I chose bio and chem, I don't want a job in the medical field (though I am open to a few). I only chose these because I was good at them. I quite like maths, the idea of working from home. I did like the idea of being a chartered accountant but I don't think I have the social skills for that. I'm painfully average, I don't do any extra curricular activities and I don't have any interests that I can turn into a career. I'm average at everything, I'm not bad but I'm not good either. I do thrive when I have a goal though, which is why I seriously need to find a future career choice or area that I can aim for. I hear everyone else talk as though they have it all figured out and I feel utterly lost. Can anyone give me some good resources where I can learn more about jobs? Or if anyone's gotten out of a situation like this please let me know. Thanks.