about my love: I was born on 2000 sept 16.

In the first place, without knowing the girl's DOB, it is impossible to predict your compatibility and future. Secondly, her changeable attitude is normal. According to your age, it is time that all your personalities are forming. Sometimes, you wanna treat people well, but you easily lose temper in other time. So if you really love her, be bearable and try to make her happy! Best wishes!