Have I ruined my life?

I did a degree in Audiology, and fell at the final hurdle. I ended up with just a pass and was devastated. So I then thought, 'what would I be good at?' and ended up studying for a degree in Biology. Although in the first semester of first year I got a 1st overall, I struggled with 2nd semester and ended up having a burnout because I just couldn't memorise everything in the 12 weeks we had in the semester and my notes are terrible. I'm scared now that I'm going to end up in a low-paid dead end job, and I KNOW I am better than that. Plus, even if I did do well and got a decent degree, I don't really know what I want to do for a career. Have I ruined my life? I have 1 year to memorise stuff before I go back for my second year. What do I do?!