Hey there! That's a super sucky position to be in, but my advice would be to try and remain calm until you get your results back (easier said than done).
If you do end up failing any of your modules, I would recommend talking to people at your university such as tutors or course advisors who can help you with the best next steps to take, whether that is at your current uni or somewhere else. I know people who have failed core modules in their degrees who have gone on to be happy and successful, so know that regardless of the outcome, there is light at the end of the tunnel.
You're only in your first year of university, so there's no need to know what exactly you want to do with the rest of your life. In some respects, it can be better to keep an open mind as having tunnel vision can work against you and blind you to other opportunites. Some of those who know what they want to do may end up to regret it later.
I can't really comment specifically on your questions, so hopefully someone else can.
All the best!