well, it's very convenient, especially in the days of online purchases.
it is possible to get around without a credit card, but do your parents want you to pay for your school books with cash (several hundred). Do you have a checking account?
The thing is, your parents can either get your a card in one of their existing accounts, or create a new account with a lower limit, and give you a card. of course the card they give you would have your name on it. this way, either you or your parents would be responsible for paying the accounts. and with the lower limit, well, you are less likely to get screwed. Go for $500 if you want.
credit card companies are interested in people your age. in fact, when i was supposed to enter college, i got an offer over the phone. but i took a year off... so after that, it was kinda tough. and you can always apply for a student card.