"I'll think about it"

People want what they want.  As someone who has been described as "too nice" by many, I have found myself in situations that I really didn't want to be in.  I'm not talking about horrific situations that could cause lifelong consequences.  Rather, I am referring to going along with the plans of others and repeatedly doing things that I really don't feel like doing.  Now, being a friend, daughter, and aunt does require compromise and giving in to others to make them happy.   This is merely part of getting along with others.  However, there are are times when others see that you are good-natured and try to bulldoze their way to what they want.   It's easy to fall into the passive-aggressive pattern of going along with it as you are fuming on the inside.  On the other hand, it's not uncommon for a "nice" person to get their back up after repeatedly making others happy.  Yes, it is hard to find that middle ground.  After being in this situation myself, my best advice is to tell the other person "I'll think about it".   This is a subtle way to alert the other person that you may not be comfortable with the situation and allows you some time to mull things over.