You hit OK, possibly lower level junior 14's, possibly strong 3.5 adult, but you expend too much energy with your somewhat awkward style and I suspect you mishit a lot in tournaments against your peers.
Look at the way your hitting partner/coach calmly hits his shots. That is what you are looking for. Look at Fed, DJ, or Murray. Their bodies are much more upright and stable, more balanced, and don't lean one way or another.
All your leaning of the upper body leads to vision problems when you hit against a compeitior's shots. In the vid, you are being fed easy balls.
Nice wide stance, lots of good footwork.
Oh, "lower level junior 14's" is not a slight. I played a 14 year old at the top of his age group, who could easily practice with the UCBerkeley varsity singles players.