Please be patient. This kitten needs your help and understanding, as much as you can provide.
Kittens at around 6 to 8 weeks old, start exploring in an insistent way. Your kitten hasn’t been allowed to do this.
Worse, all your kitten’s interactions with people have been negative experiences.
You will need to exert all your calm, loving kindness to help undo some of the damage that’s already been done. You are the first person the kitten’s encountered who hasn’t mistreated him. However, he’s still likely just waiting for that moment when you’ll start to mistreat him. It’s all he’s known, and he’s learned to expect that sort of treatment from humans.
He should probably only be allowed in one room of the house at this time, though it should be a room where you spend time. He should have the opportunity to watch you, and discover that being in the same room with you isn’t a bad experience.
He needs time to learn that you’ll respect his space, that you’ll leave him alone if he gives any of the appropriate signals (hissing, spitting, growling, staring, laying his ears back, etc.). He also needs time to learn that you’re around all good things (food, treats, etc.). And I think I’ve mentioned elsewhere in the site how I get kittens to respond via unsweetened, unflavored yogurt on the fingertips, while sitting on the floor with them.
I have to get to work, but please keep in mind that your poor little guy is going to need to learn to trust you – that you won’t hurt him, crate him, or mistreat him. More, that you’re the source of good things – food, treats, petting – but it’s all going to need to be on his schedule. Gentleness, kindness, and patience are all going to be needed, in abundance.
He’s learned some lessons about people already, but they’re not the ones that help a young creature learn to trust and like people. Unlearning is going to take some time, but hopefully someday all that mistreatment will just be a mostly-forgotten, faded memory.