What to do at university and after?

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I cant make my mind up on what course i should do at university, throughout my education i tend to be pretty flexible with my interests and strengths being good at a lot of things, i had no certainty what I wanted to become , it was difficult deciding even what gcses i wanted to do and it affected me greatly at a levels due to not having the certainty of what it is i want to do after college i ended up not giving a shit in the last year, also had to do with pretty tough stuff and living circumstances i had to deal with in that year regarding family issues which have always bothered me and think has really affected my mentality permanently . at this point I know that I can put the work in if im passionate about something, im studing science btec course atm which can be accepted by quite few universitys in various courses , ones that stick out for me are - economics with finance, computer science (softwares systems development) , marketing, software engineering, business economics with accounting, Has anyone or is studying any of these, have any advice? Any a waste of time ?