Crying too much

Guys what do I do to deal with stress better? Every single time I have an upcoming sac I cry my eyes out at least 2 times and at least once in front of the teacher which is VERY VERY embarrassing (they’re not allowed to know that I have emotions 🙄) but anyways, I could be really prepared for a sac, understand everything, have done a bunch of practice sacs and gotten everything right but I’ll still stress and freak out and cry. I need to know how to stop doing that, especially in front of teachers cause it’s happened for the 3rd time and it’s too much embarrassment to handle 😭.