Girl, forget about your teacher. Look no further than italki. It's almost guaranteed you'll get positive feedback and encouragement from someone, sooner or later. It'll probably be sooner. But damn, you need to toughen up. The source of confidence is not praise but success: when you know that you have accomplished something, you don't need the praise.

Confidence doesn't come from approval. Just ask someone who is confident!

Certainly,the advantage that you own is the courage you have .The schoollife you mentioned makes me think of mine.When I was in middle school,our teacher was so kind that each of the student likes him.Of course ,the teacher,s attitude has an important impact on your study,but the guide is your delf.Also,I think of a sentence on web,not pleased by external gains, not saddened by personnal losses . In all,you should skip of others, thought,do remember you live for yourself. Good luck .Everything goes well.

I want to give my sincere thanks to you first! It was really tough when I suddenly found my world was full of fault but without approval, which made me anxious. I think my learning experience in English has always been smooth before I met that strict teacher. I always got the highest scores and the best speaking skill in our class. Things around me were compliment and approval. I am poor at self-adjusting, actually. And I am not mature. Now I have really realized it's a great chance to get self-promotion and I need to stand up to express myself bravely! I will try my best to practice! Thank you~

You should be glad that your teacher is hard on you. That way you can improve. You must realize your English is bad and hence you need to practise even more. This is by writing more, speak often and get yourself corrected. You will never learn if not corrected. Now for your correction :) "I had been practising my oral English for more than 20 days. My teacher always find fault with me and my performance never met his approval. Sometimes I feel very frustrated. It takes me a long time to get away from my bad mood. Now I don't even know if I have any intelligence at all."