How can I show I'm maturing?

I am the youngest in my family and of 5 kids I wan to show that I'm maturing but I don't know how when I am being myself I like to play wheelchair basketball, volleyball listen to music, and hip-hop dance guess you can say I depend on my mom a lot because I have to because I have spina bifida and she do baby me I think and want if I could tell them I have a boyfriend and invite him over they would see I am maturing but my parents don't want me to have a bf yet idk I hate feeling like I still 5 instead of 16 about to be 17 i august How can I show I'm maturing???