Congratulations on getting into UBCO Nursing - I know it is a competitive program. I'm sorry to hear you didn't get into UBCV nursing this year, but don't give up!
I would say finish your undergraduate degree and apply to UBCV next year. I can't really speak to the odds of getting in as an international student - but it seems like that is what YOU really want to do, regardless of the opinions of your friends and family. It would be a great accomplishment to finish your undergrad and you can work on improving your application for next year ? Best of luck making your decision.