Just prove your parents wrong and go for it.... It is just a
part-time job anyway.
Nothing wrong with working as a waitor at a bar man, it is still
a job.
Just like smoking and drinking, nothing wrong with those, but if
you dont drink and smoke, dont pick them up. Keep a strong mind. If
people there offer you to smoke, just say no politely. Learn to
reject.
I support you.... Good luck! 