i made terrible subject choices

Like i've been taking Math AA HL and Physics HL for the whole dp1, and scored quite low but each time i thought i just needed to study harder, but its mocks for DP2 and i just came from Math AA HL paper 2 and i've just regreted all the chances to change into AA SL and it hurts so much each time someone mentions you should have swtiched classes, i know this is my fault but like no one is even trying to support me and i feel stuck alone a boarding school with 2 of my roomates constantly telling me i should've change. but i feel so depressed now. Everyday, i felt such guilt that i put myself on this path for failure. Is there something i can do to get rid of this mindset or i'm just another IB failure