You can stand up, breathe properly, and deliver a short talk from a simple structure without your body or your mind spiraling.
Your body is on your side
Before a talk, your adrenal system floods you with adrenaline. Heart rate climbs, breathing shortens, blood moves to the large muscles, and your hands may shake or go cold. Nothing in that list is a malfunction. It's the same activation a sprinter feels in the blocks, and it exists to make you alert and energetic.
The fear of public speaking usually isn't fear of the audience; it's fear of the sensations, plus the belief that everyone can see them. They mostly can't. Your internal experience is loud to you and nearly invisible to the room. Practice saying to yourself, in the last minute before you start, that this is energy arriving on time. You will still feel it. You just won't fight it, and fighting it is what turns nerves into panic.
Breathe low, speak on the exhale
When anxiety rises, breathing moves up into the chest and gets fast and shallow. That does two bad things: it keeps the alarm system switched on, and it starves your voice of the steady airflow it needs, which is why your voice goes thin and your sentences run together.
The fix is mechanical. Stand with your feet under your hips, let your shoulders drop, and breathe so your belly moves rather than your shoulders. Make the exhale longer than the inhale, roughly twice as long. Do six or eight of these breaths before you're introduced. Then, when you start speaking, begin each sentence on an outbreath. That single habit slows your pace, deepens your voice, and quietly lowers your arousal at the same time.
Three points and a pause
Most beginner panic comes from having too much unstructured material and no map. The cure is a skeleton simple enough to hold in your head under pressure: an opening line you know cold, three points, and a closing line you know cold. That's it. If you lose your place, you only ever have to find the next point, not the next word.
Add one more tool: the pause. Silence feels enormous from the inside and normal from the outside. A two-second stop between points gives the audience time to absorb and gives you time to breathe and check your map. New speakers fill those gaps with um and so; experienced speakers let them sit. Practice ending a point, stopping completely, breathing out, and then starting the next one.
Prepare and deliver a two-minute talk on something you already know well, like how you make coffee in the morning or how you chose your current apartment. Write only five things on a card: your first sentence, three points, and your last sentence. Do six slow belly breaths, then deliver it standing up, out loud, recording the audio on your phone. Listen back once and note two things: how many filled pauses you used, and whether your voice sounded as shaky as it felt.
Hint
Resist the urge to write full sentences for the middle. If your card has paragraphs on it, you'll read, and reading kills eye contact and pacing. Five short lines maximum.
Solution
A model card for the coffee talk: open with "I spent four years making bad coffee before I fixed one thing." Point one, the grind size was wrong and everything else was downstream of that. Point two, the water temperature mattered more than the beans. Point three, weighing the coffee instead of scooping it made every cup repeatable. Close with "The lesson wasn't about coffee. It was that I'd been changing the wrong variable for four years." Delivered aloud, that runs close to two minutes with pauses. On playback, most first-timers find they used far more filled pauses than they noticed and that their voice sounds steadier than it felt. That gap between felt and heard is the point of the exercise.