Why does Jyutping feel so different from how HK locals actually say it?

I'm a busy professional with only 20 minutes a day, and I'm finding that the official Jyutping for words like 'ngo5' or 'heoi3' sounds way more formal than what I hear on the street in HK. Is it normal for the romanization to feel slightly detached from natural Cantonese speech? I'm trying to master the standard rules, but I'm worried I'll sound like a textbook robot.