Many people who crossed 27 can relate themselves with these points.

I should have planned my career during 8th-9th class.

I should have made my mind that I will set my career till this particular age (24–25).

I should not have chosen my subject stream according to my parents but my interest.

I should not have wasted my time in relationship with a girl during my studies.

I shouldn't have wasted my time in social sites like Facebook and Instagram.

I shouldn't have wasted my time in chasing girls.

I should have invested my time in reading books.

I should have worked on my personality.

I should not have wasted my time in watching porns or 18+ movies.

I should have worked on my spoken English.

I should have learned multiple ways of earning money.

I should have started contributing to my family till this age.

I should have married till this age.

I should have made myself independent till this age.