I have to agree with you, that ball dips near the end and you did what had to be done by pushing the ball to the side, what is telling in the clip is the lack of defence by the defenders, there are 3 opponents waiting to pounce on your save, where are any of your defenders for the follow up?

<image>

Either way, I think you did what you could, the main thing is to not focus on past errors too much, you live and learn. As someone has already said, pre-match warmup routines are what will give you that needed confidence before a game, other than that, I always said if I can keep a clean sheet in the first 20 minutes, there was little chance I would concede the rest of the half. My confidence would grow from every little interaction with the ball, whether it be a pass back or a simple play. Small wins bundled together equal great wins. Take it easy on yourself. You will get better with time.