Why is my bump so small...

Hello mummies, erm this is my first pregnancy so i feel so worried and anxious. I am currently week 23 day 6 pregnant & tomorrow i will be 6 months pregnant already but can i ask why is the baby bump so small?? Like other ppl asked if i am really pregnant, i don’t look like 6 months pregnant , I don’t look pregnant etc.. someone please advise me... or like tell me its normal?