You may just have less of a background / less fluency with the tools you're using than your coworker does. I'd try focusing 100% on getting the task at hand do

You may just have less of a background / less fluency with the tools you're using than your coworker does. I'd try focusing 100% on getting the task at hand done while at work, but noting areas that are difficult for you and then doing some experimentation and side study on those areas after you get home. In order to make it at your first software job in a new industry, you'll possibly have to put 2 hours a night into self-directed learning.