Is it my responsibility to help my parents..?

Okay im the 2nd oldest of 5 kids. My brother whose the oldest has moved out so its just me and younger siblings. The youngest one is 8 and im 18, lately ive been staying at my friends house or my b.f house because im tired of babysitting my younger siblings. Ever since I was 10 ive basically been a second mom to them since my parents work alot. Ive sacrifice soo much of my time to helping my parents, specifically my mom because my dad never helps her. I just want to live my life without being around my siblings. I never had a normal childhood growing up because ive always took care of them. Now that im never home, my parents seem to get pissed at me because I dont want help with THEIR kids. I feel bad but I dont care anymore because when I do watch my siblings they never listen to me or they dont respect me. That's another reason why I dont want to be at home anymore. My question is do I have the right to feel this way? Btw I never got paid doing this nor did I get everything I wanted. My parents nevered spoiled me.