Feeling self conscious

Does anyone else feel they are too big for how far along they are? I’m only 16+3 and a first time mum but I’m just feel very fat rather than pregnant, I was a size 8-10 UK sizes before I fell pregnant and about 5 foot 3 and 9 1/2 stone so quite slim. It seems everyone automatically thinks because your pregnant they have the right to comment on your body. So far I’ve had a coworker joking call me fat, someone tell me I’m looking big and asking if twins run in my family. Then my sister in law asked how big the baby is now, when I told her about the size of an avocado she said ‘wow that’s tiny, how come you can have a belly already!!’ ..I just feel a bit sensitive and self conscious and I’m finding myself holding in my belly and wearing baggy tops.