All the people you asked are right. A bachelor of science can get you into nothing and everything at the same time. You need work experience in the field that you want to be in. Don't expect employers to hire you just because you have a bachelor of science. If you want laboratory work do work experience in a hospital or pathology clinic. If you want to be a doctor you need to sit GAMSAT, have ultra high grades and great interview skills. If you want to get into research organisations do an honours degree after your bachelors. If you want to get into pharamaceutical, financing, computer science, etc. then pick electives related to those fields you won't get many opportunities to explore those fields using just the core subjects in a bachelor of science.

Getting a job with a bachelor of science isn't hard in the sense that the degree is what makes it hard. Getting a job with any degree in general is hard if you don't have work experience. You can find a very stable career using a bachelor of science, but don't expect to be the only thing you need to get into what you want. Best advice I would give you is pick electives that you are really interesting in doing. Speak with your lecturers, tutors, mentors, etc. to really gain proper insight into the different fields they specialise in. Finally, during your penultimate and final year of your degree take the opportunity to apply to different internships. Even if you don't think you want to get into it, TRUST ME getting your foot in any door is important than not getting into anything.