My parents never coorperate with me?

we are three sisters. my elder sister and my younger sister get everything frm my parents but when i ask them for somthing they just ignore my talkings n say that they dont have enough time and money. even am 28 but i never felt myself as an adult. every time i get scolded because i want to live my own life and they r against my boyfriend who is 7 years younger that me.