Thank you, but so far neither have worked :( I have joined before and at one point it loaded in the texture pack and all, but then when I left and rejoined to change my roleplay name, it happened again...

So, I use optifine 1.13.2, and join the host server, but then whenever I try to connect to the highschool Roleplay server, It starts to load terrain, then I get disconnected! Please help!