If your not feeling for the character, it is most likely that you do not have natural talent for her and it is hard for you to pick her up. However, if you do like Pyrrha, don't be discouraged and play with her. It will take time but you will reach the skill level of a talented player if you play her enough.
The opposite happened for me. I'm a big fan of X but for me, it was very frustrating to play her in SC4. Although she was quick her attacks felt light and very complicated to use. The SXS stance was too complicated for me to use. When I switched to Leixia I immediately felt a connection with her and found her thousands of times easier to learn. Her attacks were very satisfying and I thoroughly enjoyed playing with her.
Sometimes, it is just pure skill level that holds you back when you play a character. I've recently come back to SC4 much better and it is way more satisfying to play X.