When I try to create a world or join one, it stops before 10% and just doesn't continue loading. I can't close the game without using the task manager.

Can you please post the resulting latest.log (game log output)?

If you are using MultiMC, from the launcher, you can do the following:

1. Right click on the instance icon and select "Edit Instance".
2. In the edit instance window, select "Minecraft Log".
3. Click "Upload".
4. Post the resulting paste.ee link here.

this seems to be an issue with pehkui

Like I have the same issue I don't know if its ram but like I give 5 gigs and still does not load and I have to completely restart my computer just to close the game!

there is an issue with fabric api 34 and Pehkui
see #197 & #191 for reference

CCA issues are fixed in 1.13.1. If you are using Pehkui, update it to the latest fix release.