I had to remove my old SKSE. It was outdated, and my mods wouldn't work because of it. ((They were all updated))
I removed SKSE from my system, wiped all my Skyrim data, and uninstalled NMM.
I installed everything again, and redid SKSE, following a tutorial that my friend showed me, which I will include below.
BUUUUUUUUUT when I tried to activate a mod, it informed me that SKSE was not installed properly.
I can't figure this out. It's driving me up the wall. I've done it 4 times now and I'm ready to throw my computer.
((I was not the one who originally installed SKSE onto my computer. My ex did. I'm not the best with technology admittedly. And maybe I really am doing something wrong.))