Roommates are refusing to let me out of my portion of the lease can I sue them in small claims court under Kansas law

I'm a tenant in an apartment with four other girls. The apartment is only four bedroom and there were originally only four tenants total. In August, however, I agreed to share a bedroom with a friend and we added her to the lease. Although I didn't agree with it, I was forced into a 1/5 rent verbal agreement (by majority rules). I didn't agree with this because my friend and I are sharing a room whereas the other tenants are not, and we have one of the smaller rooms in the apartments. So, we're paying the same amount as the other tenants, but getting less benefit.
Anyways, I would like to move out in January and discussed this with the roommates. They refused to release me from the lease unless I found a subleaser to share the same room I'm in with my friend.
Normally, I would be fine with paying rent until I found a subleaser but I worry about finding a subleaser for this room because the space we share is so small.
I suggested to the other girls that they work out sharing a room among themselves and open up a whole individual room for a subleaser if they need the money that badly. They refuse.
Our lease has 'joint and several liability' on it which means that if I left and didn't pay, the other girls would have to pay if they didn't want to get evicted. If they still wanted their money, however, they could take me to small claims court for breach of contract.
I was wondering if I might have a case against them in small claims court under the fact the agreement was only verbal and that the contract could be considered invalid due to lack of 'consideration-in that I was paying the same price as everyone but not receiving equal benefit' and the fact the contract was made under duress on my part.
I appreciate any advice I can get.
Much thanks in advance.