Pitching control

All speculation without clips but it sounds like you might be opening up early. The ball drifts high and in because your arm is dragging. When you try to correct the ball goes toward where you've opened up to. Pretty common problem.

It is very common or a RHP to throw up and in (to RHH) if he is rushing (body going to fast for the arm to catch up) and/or dropping the throwing elbow (and thus pushing the ball).

I am also a 14 yo and usually from my experience throwing high usually means I am standing straight up on my front knee too much and not bending when I land. When I throw low outside it usually means i'm just releasing the ball way too late. These are things that you just have to practice. And my arm always moves from my glove to directly behind my head and then I throw and my release point is always dirctly out in front fully stretched and then I finish with my palm up under my arm pit. Also try turning your hips before you release the ball. It help bring the ball down and gets you a little extra on te pitch. I used to be around a 74-76 pitcher. Now I throw around 79-82 ( also from working out a bit too) crusing. I have worked on a gun so it is true. It also takes less pressure of your arm. Try it, if you work better without it thats fine, sometimes different things work for different pitchers.