Problem Loading My Worlds

I have been having a problem recently and what is always happening is when I try and load into a world it will always give me a error saying "There was a problem loading this world."
Even if I try and create a new world I still get the same error message. Plus, when I try and edit said new world, it crashes my whole game. Also when I launch my Minecraft I have also been stuck on a infinite loading character/profile. I have uninstalled and reinstalled to see if that would work but in the process I lost my worlds cause I couldn't even export them to try and save them. SADNESS. I have also tried signing out and signing into my microsoft account as well to see if that would work but it didn't. So now I am here writing this to get some type of help. T.T