Lyric discussion by In the mist 

Cover art for Stand My Ground lyrics by Within Temptation

there is one sentence that i dont get in this song but jumps out the most: If I Don't Make It, Someone Else Will

when i heard the song for the first song this sentence got my attention. and i thought the song was about revenge wich that sentence would imply. but obviously the song is not about revenge

so what does that sentence mean?