I have been working for around 5 years now and haven't stuck to one programming language or framework more than 1-2 years. Not enough to an expert in any of them. Started from c#, than some web, than cpp and some Java, than some DevOps and now full time Java. Been doing Javascript along with out of interest only.

When I tell my friends how I feel about my knowledge and expertise they say I am only suffering from imposter syndrome. May be with more years I do become really good at one or two things.