Nothing in your post suggests you have grounds to break the lease.  Ants are not uncommon and are easily dealt with by purchasing sprays and traps.  That "tenants are changing frequently" is none of your concern and certainly not something that would allow you to break the lease.  As far as the rent being "super high," you obviously knew how much the rent would be when you moved in, so that's no basis to break the lease.  Not sure what you mean when you say the "living quality is low.  If you explain that better, it might change my answer.

You should discuss your concerns with your landlord, and you certainly can ask your landlord to agree to let you ought of the lease for a price, but the landlord has no obligation to agree.