getting bad grades has completely changed my life

my first post on Reddit was about me getting bad grades in O levels , I did not want to download Reddit at all , that's when my life really went downhill ,I stayed hopeful thinking Allah has a better plan for me but I cannot see that plan now and even if I don't see it , I can't stop thinking and worrying about my future, if I can't even handle alevels, how will I handle engineering unis?