I'm not playing at my best, I don't feel the ball well. I...

I'm not playing at my best, I don't feel the ball well. I have a new coach and he's changing things in my game, so the shots feel so insecure at the moment. My first (match) with him I lost in Toronto and now here. And before that I was not playing bad. Since I started with the coach, I'm not feeling so confident.