From where I sit, I see a youngster with a pretty good grasp on things.
That's a major understanding of logic for game and your position, especially for a 13 year old.
This difference is a real game changer if you can be shown why and when to toss that pitch, all up and down the batting order.
I'd like to add to Zita's comments, which by the way offered very solid advice. I would suggest working on your "go-to" pitches that you are comfortable with. Work on a dependable pitch percentage in the strike zone for various batters and work the batting order based on the reason for every batter being where they are. Also, there are sound reasons for why you pitch to each and every batter - not that you just on the bump to toss gas. Study the game more in depth about that - batter relationship to batting order, game scenario(s), your dependability % on any given day based on how well your going to perform out of the bullpen, and so on.
You impress me as having a huge jump on the logic side of this sport more than most - even older players. Don't lose grip on that mental process for the sake of launching more MPH. As you grow and mature so will the power side of your ability come around.