Roommate issues

Hey so I’m not in a great living situation with my roommates. If my roommates and I do not have our own contract (aside from the lease with our landlord) is there anyway they would be able to hold me accountable if I left before the lease was up?

If I have to wait until the lease is up I will but I’d rather not as that is in February. I don’t think they will be too keen on the idea as they have a hard time paying rent as it is (we’ve gotten warnings bc they pay rent late). But I’m also afraid the tension and general resentment towards me if I propose leaving before the lease is up and they disagree.

If they can’t hold me accountable I’d rather just make my statement that I’m leaving in a month and go.

***edit***

Yes my name is on the lease with the landlord, however one of the two I live with is the primary lease holder.