It's not incurable at all.
First step, realize that all insecurities are part of imperfection and imperfection its self is unavoidable
Second step, stop seeking things from others, especially emotionally
Third step, impulses and emotions are totally different to each other but an insecure person will act on both the same way
Two ways to go with this
One, you do actions, real life actions, not meditation and introspection or self reflection or any of that narc crap, to effectively deal with these insecurities
Assuming that's not possible or you don't desire to for whatever reason
You're fucked
Simple as that
