I think I have no future

I am a 17-year-old sixth form drop out, I left in December 2022, due to the effect on my mental health. I intend on doing 3 A-levels at a college this September however the college I had applied to and wanted to get into the most has told that I can't "re-sit A-levels" as I've already had just 2 months of basic experience with a level which by the way I learned nothing from. What do I do?, I have applied to other colleges, but they are further than I'd like for them to be, and the closest college to me only specialises in BTEC, t levels and vocation courses which I have no interest in doing? Also, I am from Manchester that there is a problem in its self.