Very interesting read. You're living your own life, one in which you have a limited amount of time on earth, so it is important to realize that you have no obligation to spend this valuable time at the beck and call of others - especially for nothing in return. People will absolutely take advantage of those who do not understand this. Glad I came across this, made me take a step back and consider how much of an "Everybody's Friend" I am in my own life.
That's the most important message I got from this: to make sure you don't let people take advantage of you or guilt you into something. Personally I need to improve on putting my foot down sometimes and tell people I simply do not have the time to help them or go out; I have bigger priorities. I'm not very assertive, but hopefully the fact that I indeed only have a limited amount of time to spend will help motivate me.