Unfortunately, your lease is binding and enforceable for the lease term stated in the contract. This is true even before you take possession. Therefore, without a provision in the lease providing a right to early termination or landlord breach (constituting constructive eviction), you are liable for the payment of rent and other obligations specified in the agreement until the end of the lease term.
So, you have a few options. First, you can try to find a new tenant to either be a subtenant or assignee of your lease.
Next you can try to negotiate a lump-sum settlement of the remaining balance on the lease.
Finally, and most risky, you can just move out without a new tenant or settlement, and hope the landlord can relet the space quickly.
The last option puts you in breach of the lease and subject to damages if the landlord sues and prevails.
With regard to the first two options, if you find a new tenant or reach a settlement with the landlord, it is most important that the terms be in writing and signed by the parties so that it is enforceable in court.