THE ENTITLEMENT MENTALITY/MINDSET. 
It's that feeling you have that, the world must revolve around you. Let me put this in practical terms. Mr A needs financial help from Mr B. Although Mr B has the resources, he however intends to use it for other projects. Mr B feels upset because he believes Mr A should help him. Mr B feels entitled to Mr B's money. 
Well, entitlement is not limited to the financial aspect only, but it's just more common.
At one point or another, you must have felt entitled to certain things. You must have felt that people should have done certain things for you and when they refused to,  you felt offended. However, you're all grown now. 😉
The good thing is that you can break off that mindset through the maturity of the mind. The earlier you realise that no one truly owes you anything, the better.  You just need to appreciate what people do for you. It's good to help, as no one has it all. However, don't be offended when you don't get help.
I understand how frustrating it can be when you're desperate, but do not allow desperation to cloud your sense of judgment.

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