So I have a question?

Yesterday was my birthday. I paid all my bills and all I asked for my birthday was for my mom to watch my kids for the weekend to get a break. My brother cash app me $20. I barely have money to give. Don’t forget it was my birthday. So my mom gets my sister here from out of town with no money to come from college for the holiday. I have a business that I run which I have a food cart. So the money I make I can’t quite touch just yet because I have to use it for things I need she has been asking for money since I started ... am I wrong for saying I don’t have it. I have it but I’m scared I might not get it back in time if I let her borrow it .? I’m mad because she is asking for money and it’s my birthday I’ve done my part as far as giving my birthday money that I barely even had ? What should I do? I’m so irritated right now people don’t look at the small things they look at what they need and want and forget about other people needs and wants