Major major mood swings

Ive been super irritated and have outbursts or just me being moody agitated and shouting at my family. It’s like I can’t control it because I snap out for a while and have a mood swing come on then a couple minutes later I’m back in a calm mood like it never happened ? Why is this happening so much I had two today and I’m 19 not on any BC which is funny because I’m kinda against getting BC cause I’m scared it’ll cause me mood swings 🤦🏻‍♀️