And we look back and thinkg 'I rolled badly' or 'I rolled well' But in reality it was more likely 'I didnt have a good chance of success' and 'I only had to roll like a 5 to hit that thing'. Often it is less the die roll that we remember but the success or failure. They guy in our group who always plays dex characters and thinks improved initiative is a must have at level 1 always 'seems' to roll well on initiative.
On the other hand people do tend to have certain things they favor. That said obviously in general people dont roll better or worse, unless they never change their dice and the dice are similar to the above mentioned d20. One of the people in my group has a green d20 that we have actually tested and its got like a 1 in 5 chance of a 20.