I get confused - use this one if you are describing situations that might happen that usually confuse you. You are not necessarily confused now.
"I get confused when I get too many e-mails at one time."
"I get confused when I try to read train schedules."
I got confused - You are talking about a situation that definitely happened in the past in which you became confused.
"I got confused when I saw the instructions."
"I got confused trying to read the signs in English."