Back on topic, at 21 living with your parents is lame to the max.
No its not,Theres nothing wrong still living with your parents.
A lot of people these days cannot afford to rent their own places,especially here in the UK where everything is so expensive!
Couple of my friends moved out of their parents when they were 18-19 as they thought it was "Un-cool"....only to have moved back in with them within a few months because they couldn't pay the rent/bills etc....they are still living with them now.
A work college of mine is 28 and still lives with his parents,Nothing to be ashamed of imo.