<human>: Can you succinctly summarize the text in 1-3 sentences?

My little brother, 17 years old is a senior in High School.  
Yet, he is still very immature and oblivious to his surroundings.  
  
My family's social class is about low-mid and our parents get by pay check to pay check.  
I myself currently have a full time job that pays minimum wage and I help pay for the cellphone bill and I also pay for my own car insurance.  
I also lend my parents money when they're short on cash.  
  
It's already bad enough my parents live pay check to pay check and also sometimes borrow money from me, my little brother is too oblivious to our family's money issue.  
  
He constantly asks for new shoes, (He's in Tennis and he sucks at taking care of his stuff), money for unnecessary school trips, new guitar, and etc.  
He also has a tendency to act like a little bitch and attempt to go to the hospital for any little things.  
Just yesterday, he racked up $300 for hospital bill because he had a bad back ache, and I had to pay for it because my parents were out of money.  
I'm getting sick and tired of him being spoiled and oblivious.  
  
All he has to do is nag and yell and my parents give him what he wants.  
If I tell him anything, my parents get mad at me and tells me to leave him alone.  
  
I'm getting tired of lending parents money because of this kind of reasons.  
  
What can I do in this kind of situation?  
  
Also, my brother and I are very distant now and we hardly ever talk to each other, and whenever we do converse, it's arguing.
<bot>: My little brother is spoiled and oblivious of our family's social class and constantly wastes our parent's money. How do I make him understand our family's situation?