Does anyone else annoy people alot by saying "i will try" rather than "i will do the thing"?

I find alot of the time people ask me to do something i cant say "i definitely will" because otherwise i feel like im lying because what if i try my best but i can't, or something unexpected interrupts it, or anything like that? Who knows what could happen.

And alot of people seem to be like frustrated by it, are you supposed to just say you will even if youre not 100% sure?

Does anyone else here struggle with this?