B in college math class as deferred student

I got a B in Calc 3 via dual enrollment and I was recently deferred from MIT. Will this completely ruin my chances? My final was worth a large portion of my grade and let’s just say I completely bombed it. I am really stressed out now because not only will it tank my GPA, but now I fear it will hurt my college admission chances.

Someone please help. I don’t want to sound pretentious or anything. I’m genuinely worried.

You made it to Calc 3 in high school. That is pretty impressive itself. Don’t stress over a B that 's actually really good.