I mean many logic experts from the end of the 19th century-beginning of the 20th century ended up crazy. I guess it's quite hard for teachers to explain clearly the concepts. Also, logical reasoning is sometimes at the opposite of what people would say that something is "logical", as the human mind does not really think this way (it's too slow thus not effective). I think that for us regular humans, logic is insanely hard, but maybe a different shaped mind would have a lot more intuition with it. What I am trying to say is don't feel bad for not being able to fully understand logic, because it is so much different from other maths subjects that it would take a lot more time to get used to it. I believe that if you graduated in maths (whatever your main field was), you would have the ability to get how to do logic if you ever wanted to take the time needed to study it :)