Olivia, you can screw back the longer screws that go on the inside. In the photo marked with orange. Then open and close the lid of the MacBook a few times. This will fit the 4 screws more properly in the steel inner-frame and they can come a little bit loose.
Close the lid again. Leave the inner screws untouched and begin with the outer screws (marked with red) with indeed a perfect matching screwdriver head (with a big and long grip for your hand). This worked for me perfectly without damage. Success!
With some of the screws that can happen. I had it too. This did it for the MacBook I was repairing: 1. Open the MacBook. Then press firm but gentle on the upper case with your hand or fingers while trying to loosen the screw with your screwdriver. 2. I used a different screwdriver from the same size diameter but with a much larger hand-grip. Success!