What should a do

Im a freshman at travis high school and rhp and my fastball sits at 84 I throw a curveball, slider,sinker,and a nasty cutter the coach only wants me to work on pitching but I play infield also what should I do

Do whatever you want. If your heart isn’t into it, I don’t care if you throw 100 mph, you’re not going to be successful. Sounds like you prefer playing the field, so do it.