The information you need will be in your lease agreement. Time to dig it out and start reading.

Generally, there is a fee for leaving a lease early. Years ago, it used to be equivalent to half or a full months rent. These days, I see more people complaining that you're on the hook for rent until they can find another tenant which could, theoretically, be until next December. Your lease agreement will have the details as well as how to move forward with doing it if you truly want to.

While looking, if you find it would be financially impossible to break the lease, look for information in the agreement about subletting the apartment. If it's possible (it's not guaranteed to be an option), you might be able to rent out the apartment to someone else for the duration of your lease.