how thick are dicks??

So so I'm a virgin and only seen dicks in porn at the most, I've never been into a add shop so I've never seen dildos irl. I read  some article which said the average thickness (no not length) of a dick is 4inches😳 which didn't seem to bad until it tried putting something that was 2 inches thick (just out of curiousity to see if i could manage it. Rinsed my mouth and the tube afterwards) and almost breaking my jaw.
Surely they can't be that thick! 
Obviously I know all dicks are different and I don't expect anyone to go measure their S/O for me but just on average what would you say?