I am a male-to-female transgender but recently I have been feeling like I'm pretending when I am feminine and don't get upset when I am masculine... Is it possible that I'm not transgender after all?

Sometimes we go through phases. When we do things, we should do them by heart and not by brain. Do what you think is right.

Feminine and masculine are concepts that have strong cultural connotations. There are things that are generally associated with one gender in a specific culture, but they're actually things that anyone can relate with, display or enjoy, regardless of their gender. Perhaps you feel these way because you find that some gender stereotypes do not fit you, but your true gender is something that goes deeper than cultural stereotypes and associations. You might still be trans even if you don't 100% fit the feminine stereotype. But maybe it can be of some help to discuss these feelings with people in the trans community, or even better with a therapist, to get a clearer view on your feelings and what they might mean.

I have known many people who have transitioned from mtf and ftm. They all do it for the same reason.. To love their true self. It is possible that you transitioned into a person you are not but it is also possible that you are just a more masculine female. All I can really say is be who you feel you are. It doesn't matter what I say or what anyone else says. If you feel as though you aren't happy with your transition then there is also room to go back. Don't feel like you have to be someone you truly aren't. I hope this has help :)