Firstly, if you want to invest your money and actually make some profit, don't put it in the bank. Banks don't pay an interest rate anywhere close to the inflation rate, thus your money, while growing greater in quantity, actually shrinks in value. You're young, invest in something with a higher risk, and thus higher reward.
Secondly, buy a bicycle. Cheaper and healthier.
EDIT: Bike might not be a better option if the city is huge. How far do you have to go on your vehicle?