How do you stop moochers from wanting your money every payday?

Every payday my mom always asks me for money for something. I make approximately 1100 dollars each 2 weeks. Now I have a friend that is always asking me for $10 in exchange for pictures, and another wants me to send him $150 to pay his bond out of jail. Last week some random guy asked me for $400. What the hell do people think I am? It's like I never can have enough money after paying my sister $875 every two weeks for payment towards a mortgage rent. I'm tired of it. Don't people see I have needs too?

How do you stop moochers from wanting your money every payday?
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