Is there some sort of autospliter, or you need to do it manualy?

There is an autosplitter in LiveSplit. To activate it, go to "Edit Splits..." There should be a section called "Autosplitting and load removal by DrLa" Make sure you click the "Activate" button, then it should work.

i tried that right now, but it doesnt work for me. Im really new to speedrunning and livesplit. Help?

Perhaps try to add -gl to your launch options to force Hardware mode.