Period Cycle

Hello everyone! I’ve had some concerns with my cycle recently, Its been pretty irregular. I got my period at 12 and im currently 14, turning 15 soon. I can never predict when I will start, every month is a different amount of days in between. Im a virgin so it’s nothing like pregnancy. It’s been concerning me for a while. but I have some theories. My mom tells me things like stress can affect your cycle, but anything that stresses me out is nothing long term. Although I can be pretty anxious a-lot. Is this normal?? Any advice or suggestions are appreciated!!