One headlight works and other doesn't but when I switch bulbs I still have same issue. Drivers side dayrtime n highbeem works and passenger side just low beem works but when I switch bulbs then its still same problem. The bulb that worked as low beem in passenger side only works as highbeam and daytime on drivers side.

There could be several reasons why the driver side headlight on your 2007 Pontiac G6 is not working. Some possible causes include a blown headlight bulb, a faulty headlight relay, or a problem with the headlight wiring. It's also possible that the issue is related to the turn signal, as you mentioned that it was staying on. I would recommend checking the headlight bulb first. If it is blown, replace it with a new one. If the bulb is fine, the issue may be with the headlight relay or wiring. You can also check the turn signal switch or the multifunction switch, which controls the turn signals and headlight. It may be possible that the switch is defective or malfunctioning. It would be best to get the vehicle inspected by a professional mechanic to determine the cause of the problem and make the necessary repairs.

Sounds like a switch issue.

bad connection or bad earth check all connection or bulb

check the fuses as it has a fuse for each headlight if iam not mistaken

If the good bulb worked on both sides and the bad bulb did not work on either side [I think this what you said] then the bulb is burnt out.
Just to be sure see if the supposed defective bulb works on High beam.

When looking from the outside of the headlight at the bulb, can you see the bulb clearly??
These lenses are notorious for dulling very badly. If it has you can use a regular headlight 'restoring' kit sold at most auto part locations.

If it is not a lens issue, you may have a wiring/supply issue.
Then you would need to find the troublesome wire/connection.
I am not the best at wiring issues, but I would try to find a power source wire with the same amperage rating, run a bypass jumper from a known good voltage source and see if the light changes. If no change, your problem may be the harness or plug at the rear of the headlight bulb.
Hope I could help
GL

More than likely the problem is with the control switch that turns on the high beams, that switch is mounted on the steering column, the high electrical current load that the high beams draw burns the contact inside the switch and the end result is what is going on with your car. To replace the dimmer/headlight switch you will need to remove the trim around the steering column to access the switch for replacement.

TEST
remove both bulbs from the lamps but leave them on their wires switch on and see if the bulbs are still different brightness if not they the passenger side lamp housing has damaged mirror is dirty or missalined and needs adjustment. if they are different brightness then this may be a earthing problem.

If you know that you have power, then the ground is bad. There should be a ground wire at the body near the harness for the headlights.

bad headlight switch