Choose a career that involves a lot of what you love doing, that you will love dealing with for a long time. Or that you feel called to do. That love will have to last and sustain you unconditionally, through university, many courses and degrees, multiple years in the job industry and eventually into retirement.
Why do you need to bear this in mind? For two reasons.
One. Being a summer student or an intern in university working in the firm and actually working in the firm with expenses to pay are completely different things.
Two. Sometimes your job entails more of what you don't want to do than what you actually want to do. So will your career. Actually, more often than not.