You’ll always have insecurities and anxieties.
For example, take relationship status.
When you’re single, you worry about going on dates and finding someone to be in a relationship with.
Then when you’re in a relationship, you worry about am I having fun, are we compatible, am I doing a good job being a partner, and then eventually you start asking should i marry this person?
Then, when you get married, you worry about living together, having kids, finances.
in other words, insecurities and anxieties for a given part of your life will never go away.
Instead, the key is learning to be good with insecurities and anxieties — learning the best way to deal with and manage them in your own way.