Is anyone else a horrible, horrible worker?

Hi! I turned from a rather good and smart student into a honestly just shitty worker, and I don't know what to do about it. It's not lack of experience (I have got), it's not skilled tasks. Just "walk around and pick up stuff" type of work and everyone is way ahead of me and does it much better, despite me doing 200% of what I can do... but compared to everyone else, it's barely 60%. Everyone assumes that I aim for quality, but I really ditch every quality effort in order to move as fast as I can, and I keep biting the dust while ending up with very messy results. If I do aim for the quality, the speed becomes so terrible that it makes myself uncomfortable. I love my job and don't want to change it to anything else. Has anyone else gone through this ordeal? Any tips?