Every time I use Google Maps, it underestimates the time it takes me to drive there

It’s a weird feeling going on a journey and it’s 30 minutes, but it’s really 45 minutes. I’m so sorry if this has been posted before (I couldn’t find it), but it’s going on all the time. It’s been like this for years and it’s not just me. I asked my family and they have the same experience. The traffic is way more than Google Maps says.