How do I split push when my team ints whenever I leave it?

I have this problem where whenever I try to split my team engages 4v5 (even when behind) and dies. (I´m in Gold IV). What do I do against that? I can´t really let my team die but on the other hand my champions are shit in teamfights. Pls I really need some advice because this is a problem I´ve been having for so long and I just don´t know what to do.
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