Hi there,
I can recommend 2 great sites to assist you with exploring your future;
1) UCAS Hub: You will no doubt already be familiar with UCAS as it is the site you use to apply to university. It has another couple of features that you might find useful; a careers quiz and personality quiz which they can lead onto suggesting what yo might like to study.
2) Prospects: Another great site to explore you potential pathways - the career quiz is really good and can link you to lots of courses and ways to study.
Other than that, I think the best bit of advice I can give you is to chose a subject that you LOVE as you will be dedicating the next three years to studying it. Go to Open Days and research research research!!!