I think everyone has been encouraged or pushed to do something they would prefer not to have done. The first time, we all kinda do it because we are not sure what else to do... The second time, we either know that we want to or don't want to.
Depending upon what it is, usually, at first... I'll politely say, Nope, and have a truthful reason or excuse... if they get real pushy... then I forget to be polite and I say bluntly... NOPE.
Of course, there are some situations that we end up having to do even though we don't want to. I mean how many of us like to do house work? Or yard work? And yet, we do it, because we have to... it's our job or responsibility. So, I guess, it may depend on the situation and who it is doing the pushing.
I don't know if this was helpful, but it's nice to know that you are not alone struggling with this kind of thing.
God's Peace,
D'Ann