Is This Weird? Or Normal?

So, I have been having periods since I was 10 years old. I am now 15 about to be 16. I've been having them for 5 years and for the most part I had them once a month.

Around 14 about to be 15, I started getting periods every other month. But, my friend was the same way so I didn't see the need to be alarmed. And I also heard it was normal so, cool.

Now I am 15 about to be 16 and my period is starting to come 2 MONTHS FROM EACH OTHER!!! I know, y'all are probably like,

"Eida. What the hell are you complaining about?"

Like it's cool and all, but is this normal, or weird? Will by next year my periods be 3 months apart? By 25 about to be 26, will I only get a period once a year? Find out on the next episode of Dragon Ball Z!!!