Drywall installation when ceiling joists lower at the edge
No. That's in no way going to yield a satisfactory result for the reason you mentioned.
By now you realize that you should've examined the framing before you began hanging drywall. You have two options:


Pull down part of the drywall and install shims on the joists approaching the beam to blend into it, creating a downslope in the ceiling. You could reduce the amount of the slope by using some 1/4" drywall under the beam itself and setting your other drywall flush with that.
Pull down all the drywall and shim the entire area down flush with the beam.