It sounds as it you are magnifying the imperfections of your time studying, gemmam! The past is the past, anything you regret can't be changed. But to me, it seems you got many positive things out of it; a partner, good friends and a great qualification. You have options going forward that a lot of people don't have. If you don't like where it has taken you...that's one less path to take! Whatever you do next will be based on your experiences, good or bad.
There will likely be opportunities that arise in the future that you never expected. Don't focus too hard on landing a 'graduate job' in your chosen field. That's just one way to go that might not be for you anyway!