I think that there are two extremely harmful narratives that have reached wide acceptance in the last few generations:

1) There's a soulmate out there for you

2) You shouldn't change who you are for your partner

Both of which combine to create the barrage of unhappy relationship stories that you hear today. Really, I think that you can be happy with just about anyone who is willing to listen to you and change their mind when they're wrong.

Because you are wrong about something. Maybe it's major, maybe it's minor, maybe it's a "facet of your personality" which is destructive, and you should be willing to update the way that you interact with the world based on new information. Going into relationships as an immutable person is a quick way to dwindle your dating pool down to practically nothing or decrease the quality of the relationship for your partner.