I hate my parents for this

Good day mamas and papas in the house, please I need help. I'm the eldest of five siblings. My mother stays at home and my dad works abroad. My mother used to have a nice government job but she quit (with my father's influence) because she was about to have me. Since then, she never entered the workforce and continued to have my 4 younger siblings. My parents never used any form of contraception because they only believe in natural family planning. They're both religious. My dad, the only breadwinner in the household, also doesn't earn that much, just enough for our needs. I'm just really pissed at them for making obviously poor decisions. I'm also pissed at them for believing in religious crap that having more children means having more blessings, and that contraception is wrong, blah blah blah. They can't keep up with meeting all of our needs (they tend to forget even small stuff like freaking socks), they obviously can't give us the good education, good opportunities to learn hobbies and other self-development stuff, nice things, etc. because of their financial situation. My fights with my mom always end in me insulting her and my dad for having so many children they can't support properly. She just answers me, "So what do you want to do, kill them?" It's so stupid. I always tell her that because of this, I don't ever want to have kids. It's also so annoying how my dad always complains he works hard to send us money and it never seems to be enough. I told my girlfriend this and she said I was just being a brat. Please mamas, am I right or wrong to feel this way?