I was just wondering why it is that some people look like they way less then they do and why some people look like they way alot more.

For instance people tell me all the time I look like I weigh 185-190 pounds and I only weigh 165. Some guy was even trying to give me some old clothes he didnt fit into anymore that were about a 33 waist, I told him 30 was the biggest I could fit into and that even then I would need a belt and he was so surprised he said I looked bigger then that.

Anyways I've been trying to figure out why this is and I just can't I thought maybe it had something to do with BF precentages but wasnt sure. So if someone who knows the answer to this could please explain I would gretly appreciate. I've been trying to figure it out but I just can't.