I pay for my fair share of basic bills, or 25% of water, electric, internet, groceries, and other utilities. I buy my own snacks, video games, clothes, and makeup/hygiene products. I pay for gas if I'm requesting a ride to somewhere. I cover my tuition/book fees and cell phone bills. I do not pay for rent.
I still live with my parents, and they do help support me still. At my age, my dependence on my parents can be interpreted as either understandable or unusual. On one hand, I'm trying my hardest to get through college and not drown in student debt, so my situation is fine. On the other hand, I have plenty of friends who are attending school full-time, working full-time, and may or may not have families or social lives. Some make it, and I commend them. Some break.