I am 21 year old female i works as a chef, i don't eat regular meals, i smoke, i weight 49kg is this normal? had my sugar levels taken it was 6.5 ?

Yes: I admire your profession and your weight seems fine depending on your height. Much as i hate to advise this, being an ex-heavy smoker, please stop smoking, i beg you. I go to a weekly cancer conference and an inordinate number of untreatable cancer patients are smokers. Easier said than done, i know. Keep trying ; failing until you succeed. Be a chef. Make people happy.