Since I was 4 years old to now (13 years) my mother has been my main piano teacher. She's very very strict and "mean" especially if she's facing a student who plays badly. She forced me to practice when I started to get bored, so I never had a "lost interest" fase. One of my worst experiences with her is when I was 5 years old I had a bad habit of playing with flat fingers, not curved ones (my wrist couldn't keep straight, it kept falling on the wood behind the keys-the place where the lock is usually placed on an upright piano-what do you call it) and she put a sharp cutter bellow my wrist so if it fell again I could get cut! It was quite successful but then I did something wrong again (can't remember) and she lost her temper, she brought done the knife on the piano wood (you can still see the deep "ditch" she made on the piano). She made me afraid of lessons, and strangely it still has some effect until now. However, she is a good teacher, and from her 6 piano students who went through exams 4 got distinction and 2 merit.
When I practice by myself, I can play the piece well, even with her sitting on the couch, but when she annouces she'll start listening carefully I keep making mistakes that make it look like I've never practiced at all! Once a Mozart sonata went to pieces in front of her even though I could do it perfectly before. I reckon that is because I'm afraid she'll explode if I make a little mistake, so instead of playing perfect that thought makes me make mistakes. I even recognize that in other students, they play awful in front of my mother but when she asks me to check them they play well. All of those mistakes make my mother think that I don't give any attention to details, but really I'm a perfectionist!! Do you have any suggestions to make me play normally?