i can speak relatively fine when i'm at ease, or even with

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i can speak relatively fine when i'm at ease, or even with a bit of pressure on me. but today i had a presentation that i thought i was gonna do totally fine in, but ended up being the shittiest presenter in class. i'll admit that i was unprepared and banking on my ability to improvise. however this still totally caught be off guard, and although nobody really seemed to mind, it was internally embarrassing. shouldn't a great speaker be able to perform well in any situation?

so, any tips on how to improve my overall speaking ability? i don't mean just for speeches, but also for conversations. my issue seems to be that i sometimes can't get my sentences to come together fast enough. my voice projection is fine. at least i've somewhat learnt to replace the 'um's and the 'uh's with silent pauses.

i was thinking perhaps i could practice speaking in front of the mirror for about an aggregate of 30 mins per day, about any random subject

(btw i speak english as a 2nd language, but i have the same problem in my native language as well, so it's probably an issue with my overall speech processing ability)