Can't recover from a failure

This is something that I have realised quite recently.
I feel like I have not fully recovered from a massive failure.2 years ago I found myself in clearing after having had worked so damn hard for 2 years.Resitting Alevels wasn't an option if I was to apply again for the same course just to get into a university whose offer I had missed.So university was the only choice.
I didn't put in much work in first year because then I was doing additional work (Alevel revision) in order to transfer universities.Unfortunately my course varies between universities so entry is to 1st year only.I found out I didn't make my transfer so had to return to my current university for 2nd year which I am currently in.
I can't be bothered to do anything whether it be applying for placements, revising or work experience.Whenever I try to do anything I get this "why bother, you'll fail again like you always do?" voice in my head and before I know it I have given up. If I get a bad grade (not necessarily a fail) I will be OK with it,it doesn't bother me at all.It saddens me because 2 years ago I would have never accepted a mediocre result. I remember one of my Alevel teachers saying to me just before I left 6th form "your work ethic is incredible don't you ever lose it". I want a first class but my work ethic , determination I have always had from a young age have perished.

N.B 3rd year makes up 50% & 4th year makes up 50% of my final degree classification so I haven't eff'd up yet.

Any advice?
thanks

My parents weren't having me resit Alevels because it would be a 'waste' of a year.
So I re-sat my Alevels whilst doing first year as a private candidate.

Thankyou so much.Its not that I'm depressed, have confidence/self esteem issues, I feel absolutely fine.It is just motivation to work that I can't seem to get back. I will try and find it.
Thanks again for your reply!