I moved out when I got married at age 24.

I learned from my sisters who moved out to
live in apartments.
It was much easier to
remain at home, pay my mom rent,
than to have to strugle paying
bills while going to school and working.
(I must say I had a wonderful mom which
made remaining at home a pleasure)

I agree with stacwase, If you do move out, make
sure you have a decent job with health insurance.
(and don't get involved with a looser boyfriend that
can't pay his share.)
It's not fun having to strugle and making ends meet.