@icameforhelp Yeah as other people have addressed, if you have a calorie surplus you should be gaining fat.
With your very active lifestyle you're either not in a calorie surplus or have a more specific issue related to metabolism or digestion that I'm in no way qualified to speculate on.
But yeah, it's worth trying to lift heavy (and safely) enough that your muscles are a bit sore the next day, doing this 3 or so times a week may be the only difference you need, or it could be something else entirely.
Even if you do start gaining fat you'll still likely want to do this as a skinny-fat body isn't all that healthy and almost never looks "big" in the way you seem to be aiming for.
Edit: I just noticed you've only been doing this for 7 days. I would say keep it up for now and see where you are in a month minimum. The amount of weight you can safely gain in a week is smaller than general fluctuations do to hydration etc so you can't reliably detect weight changes over such a short period.