You can read the lease, but typically there's not a provision to break it.
Go talk to the manager and see what can be done.
Sometimes you can pay a couple of months and loose your deposit.
Sometimes you can try to get a replacement tenant.
These days they may have someone who wants to rent your apartment for more money.
The more time you can give the manager typically the better it will be for you.
You want to do everything you can to make sure there is no negative information associated with your lease.. or it could be difficult to lease again in the future.