Stressed Out

Why do I have to act like a mother figure when I am not? Why am I held responsible of taking care of a minor, when it is not MY kid? Why am I being paid LESS than what I could possibly make if I was working elsewhere? I seriously cannot stand babysitting & I can't see myself sitting at home taking care of my little sister anymore. I don't see myself doing so & I am not happy doing it. I just don't want to do it, that's a fact. Sometimes, I just wish my mom never made a dumbass mistake and gave birth to her, but that's just too cruel to say, but it is somewhat true. Otherwise, I could just take care of myself & do me, instead of having to worry about another young one. & I could possibly have moved out or been responsible of my own being, instead of be responsible & careful on how my actions can affect another young one. I just HATE this burden on me, I AM NOT HAPPY. I don't want to be held accountable taking care of someone. I ain't making shiiittt. $300 ain't taking me no where. $100 goes to braces, another $100 to gas for the month, & $100 JUST for MYSELF? That ain't enough. I've been a broke ass for the past month now. Sick & tired of this. I don't want to babysit. I just want to leave her fucking home alone, thank goodness my stepdad still works early morning shifts and comes home in time to leave the door open for her & take care of her. But shiiit, I am NOT trying to apply for full-time/part-time jobs for the next 5 months & give them crappy availability hours because I have to fucking babysit. No, I don't want to do it. I've had enough. I need $$$ NOW. I need to be able to pay for my summer vacation & just save up. I need $700+ by July/August, which is coming soon, but I haven't made jackshit to be able to put money aside to save & add up so it will be enough by the time summer hits. I HATE asking my parents for money when the $300 is just not enough. & when I fucking do ask them for gas money because I ran out of the $300 or because that monthly payment just was not enough, they be like, where the hell did the gas money I just gave you last week go? Did you give it away? Where the hell did you drive to? Uhm shit & with the gas price increasing...I probably will eventually have to ask them for more money & I hate how they treat me. Its already hard enough asking for money when I have ALWAYS been independent and handled all my finances, except for my insurance & what not. But still, I never bother my parents for anything. Gaaahh!