I feel guilty for not getting everything done

So FYI: I’m a full time overnight stocker, and I’d say I’m fairly decent at it, 9/10 times I get all my pallets done unless it’s REALLY bad, but on my first night of the week I’m a bit slow, tonight I was told to stock international, 3 normal sized pallets and one larger one, I don’t work international that much (like one or maybe two times a week) and I’m kinda slow working it, now I feel guilty that I might have to take an unworked pallet back like the last few times and my coach will probably be pissy about it.

Just a side note: i don’t care about this job, I’m actually leaving for Home Depot soon, but I’m not looking to get fired before I get hired at my next job