This is been bothering me recently..Iv noticed that my periods have changed

Last month it was just a brown color but it lasted longer than usuall for about 9 days... Normally they only last for something like 5 days..and start every 28-33 days apart
But now its late and im kinda worried because my last one was unusual
I havent been sexually active recently so there is no chance of pregnancy

Although i thought it could be due to my diet i havent been eating a healthy diet at all this month..Ive sorta just pigged out n had the odd healthy snack..but im not over weight.
Also as its around the christmas / new year time.. My college has been closed so my routine has changed i have been awake more at night and sleeping at day, and also stress about christmas shopping! :S

But i duno if this could be the cause..im freaking out tho because a girl i know recently found out that shes been going through menopause, and shes real young also.. so im just worried if itd happen to me....