Minecraft Worlds and Servers Not Loading!

Personal Worlds.

Whenever I Try to load one of my worlds, It Goes Through Everything But then it says "0%" And Never Loads My World. I Tried Every Video I could find But nothing ever changed. I Even tried Reinstalling M.C. and Not even that did anything.

Online Servers.

When I try to go to multiplayer servers, It can go 1 of 2 ways. Either It Is Stuck when I join a Large Server like Hypixel, or If I join a smaller server like MCORIGINS, it Could Just load my Hotbar then freeze. And if I click it crashes.

It's really annoying because I Love servers like MCORIGINS and Hypixel and I hope I can eventually fix this problem.

I have messed with settings and watched almost all the Vids I could find but none of them do anything to help the Problem. I also have a Very powerful computer that has no problem loading servers on Larger games like 7 Days to Die.