Period suddenly regular???

So I’ve had my period since I was like 13/14 but they’ve always been irregular and the cycle would be more than a month, like every 2 or 2 and a half months maybe even 3 at times. But I recently turned 20 and now my periods are coming a month after the last one started?? Why the sudden change? Are my hormones now balanced out? I read periods can be irregular for the first few years but it has been a while leading up to this now. I’ve never experienced any period pain or stomach pain or anything. V confused.