There is a hinge on the door to my garage that closes the door automatically, can I remove it?

It’s your house so you can basically do as you please, but before you do you should understand why the self-closure rule is in place. There is a possibility that this door will be left open without the loaded hinges. The problem with this is that the door is a safety barrier to fire and toxic fumes and deadly gases which often originate in garages. It is not unheard of to find a vehicle running unintentionally in your garage. A child playing with keys is a common culprit for unintentional vehicle starts. It is annoying when the door hits you because of the self-closure but it is nice to know the door is always closed in case of fire and fumes.