Low Budget Automatic Grow

I'm feeling really down rn. I've just seen like 10 random auto diaries on this site and all of them had a nice big and strong plant by week 4. My plant is growing really slow, the leaves are starting to turn yellow as my other grow, I just don't know what I'm doing wrong. Maybe growing doesn't really suit me. I love growing, I love taking care of the plants, but this is just wasting money. I've read countless guides on how to grow but none of them prepared me for this. I have no idea of what's wrong, why does it grow so fucking slow?! My friend had even worse setup with even weaker lights and didn't even fertilize it, he just watered it once a time and didn't really care for it and it ended up pretty good. I just don't know what I'm doing wrong. I should probably quit.