Dont worry... I think it can be something similar to what happened to me when started playing Tekken 6 (for serious) some months ago: everyone got used to the moves of all the old players, specially characters like Sigfried or Mitsurugi that have some moves since Soul Edge. In Tekken, my rivals can simply make a basic combo and I will fall for it cause I see them for the first time, and when I think I will fool someone with some classy cancel that I learned, they already dealed with it in the past like 1000 times so I dont surprise them.
Once you get used to the moves of all the characters as rivals, it will become much easier. I personally try to play with every character just so I can understand how they play and to train my eye so I can recognize the start of a move or something, but of course its not that hard if I have played all the other SC's.
So... who is your main character now?