Struggling with basic white sandwich bread

I just recently started attempting to bake bread. I've watched countless videos with measurements that are all over the place, and that picture is my fourth overall attempt with the same result. I try to find out what's wrong, but I find it difficult to understand anything I see or read, because I learn much easier in person. Anyway, here are some measurements for this specific recipe

2 cups warm water

2 packets of yeast or 4.5 tsp

2 tbsp of sugar

6 cups of all purpose flour

2 tsp himalayan pink salt

I let the yeast sit in the water for 10 minutes until it got all foamy, measured and sifted the flour into a separate bowl, added the salt, mixed that up, then gradually added it to the yeast. There was quite a bit of flour left over, but I felt apprehensive about not following the youtube video I was watching, so I just went with it and started kneading the dough for 8 minutes. It seemed alright after that, so I oiled the bowl and set it in there with a towel over it for an hour. I'm pretty temperature blind, so I couldn't say how hot or cold it is in my house, but I turned the oven on a bit and cracked the door to help it along. After the hour was up, I punched it down, cut the dough in half, then pressed both pieces into roughly 9x12 inch rectangles, then rolled them up, pinched the seams, and tucked the sides underneath. I greased a couple loaf pans, set a damp towel over them, and let them sit for half an hour, as the recipe says. Now comes the really confusing part for me. They had risen a little bit, but not much, so I let them sit a bit longer, but nothing else happened. I turned the oven on and off to get the area warm again, but still nothing. I could hear the dough making noise through the whole ordeal, but 3-4 hours later, still nothing. I decided to pop them in the oven anyway and that picture is the result. I'd really appreciate any answers or advice. I don't have the money to take a class or go somewhere else to learn this in person, but I'm trying to find anything I can, because I'm starting to like baking in general, but I've always been obsessed with bread my whole life. After four attempts with the same result, I'm running out of flour and mental energy