Internally struggling with an upcoming presentation

I’ve done up to 5 presentations before (in person & online). I was terrible at all of them!! The first in person presentation I was red like a tomato the whole time & the online ones I was stuttering and having trouble with getting my words together.

I’m in college level courses and I don’t think I can back out of this one lol. The instructor said he’s grading on volume and tone & I’m a soft spoken and shy person when it comes to public speaking.

Idk how I’ll pull this off. Anyone care to share some of their good experience with their public speaking skills?