Nursing is a tough job, no doubt about it. But you won't know unless you try! If you start it and you hate it, there's no reason you can't restart a different course. Or you could even finish the nursing course and then do a masters in something else (eg- a PGCE or a pre-reg physio, midwifery, occupational therapy course, etc). Then you can always go back to nursing again at a later date. Either way, go for it!