How can I stop people pleasing and say no without excuses?

my whole life I’ve been a people pleaser, and I’m still learning my way out of it but I noticed I still fall into plans I never wanted to do in the first place, or when I do build up the courage to cancel a plan it’s usually making up an excuse. I’d like to be better and just be able to sit comfortably in saying no without giving reason

How can I stop people pleasing and say no without excuses?
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