Macnsalt

There's a plugin called "World Border" It doesn't just creates border it also trims your world into a shape Description reads: This plugin is intended to efficiently provide a border for each of your worlds, which only people granted special bypass access are allowed beyond. These borders can be round/elliptic or square/rectangular. As the plugin has been written with performance as the most important goal, it should have no performance impact on your server. Additional world trimming and filling commands are available as well. Link: https://dev.bukkit.org/projects/worldborder

No,unless the server owner gave you acces to console

found the answer to this:

I want to change the server's version from 1.14 to 1.8 Not my minecraft version but the server's version