It very much depends on the field, for degrees that aren't vocational (law, dentistry, medicine, etc) they tend to me flexible with what careers you go into. Something like history, or English can allow you to go into consulting, marketing, even finance. Degrees give you all sort of skills and if you do love and have genuine interest for your subject, the opportunity to gain more subject specific knowledge in that area as well.
It's important to get work experience, internships as many as you can do across various fields (if you are unsure of what you want to do), also networking. Look at opportunities within your university e.g academic rep, academic roles, leadership roles in societies, networking events, advocacy etc. Also engage with the careers service, they help massively even if you don't have a clear set career with helping you find opportunities, preparing for interviews, helping you with applications.
University is meant to be hard and it is, but you can get better at studying. There's loads of study tools and advice on YouTube etc, your academic/personal tutor will have ways to help you. Going to office hours and discussing what you find difficult with seminar tutors and lecturers is also good to get help on. Your university also likely through the library has study skill help, because there are ways to get better at reading, understanding content, scheduling your time better to go back over content, etc. If its a matter of not being willing to do the work, while vocational training is different, if you can't be disciplined, its not going to get the work done for you.
There are loads of things you can do to improve and depending on your subject, (ask and use the services your university have to help you).
Plus often after semester 1 and going into y2 you may have lots more optional modules and control over what sort of things you look into.
What subject do you do actually? As it does make quite a difference.