What is causing my heart to speed up for no reason? It feels like I am panicked for no reason.

Minerals. Heart rate/rhythm issues are often related to inadequate mineral intake. This especially applies to low magnesium and potassium intake. That being said, it is common for those in their mid teens to mid thirties to have PSVT. In layman's language, the heart rate suddenly increases for very short periods of time. You can have shortness of breath &/or panicky feelings associated with this.