No you’re not.
I’m Canadian. We have first past the post. Largely its a toss up between 1 of 2 parties federally but our far left party has won provincial elections and was within spitting distance of winning federally in recent memory.
It isnt fptp that’s prevenring you from electing a third party. Its your share delusion that it can’t happen.
Or so many of them died they can’t influence policy anymore.