Yes I am sure Im not 16

I was asked by two different people today at separate occasions whether I was going on schoolies. And last week my Mum's friend asked whether I was 16 and was so shocked when I told her no I'm about to finish uni. I dont think i look that young although being asian makes me look young but 16... thats going a bit far (I even got 14 last year). Like today I was shopping at Dan Murphys buying some drinks and I got asked whether I was buying alcohol for schoolies. I then went to a shop later on to talk to the manager about which days I had to work and he asked, "Why? Do you want some time off for schoolies?". And even more humiliating was when I applied for a retail job last week and the manager asked me how old I was. I stumbled a bit because I was about to say 21 (cuz im nearly turning 21) but am actually 20. He then looked at me like he knew I was lying about my age and said, "Sure.... Are you sure you are 20?". And I'm like, "Yeah of course I know". He looked away like he didn't believe me and said, "Yeah well then ill contact you shortly if we have availability". He probably threw away my resume straight after I left the shop. I don't think I look that young!!