Yes, during the teenage years, irregular period are very normal. Hang in there. it should start to show soon and I do think it is great if you can talk to your mom, aunt, sister, grandma about these kinds of things. peace
I've heard that when you first start your period, it can be irregular, so that could be why. Also, stress, changes in diet and exercise, and traveling can affect your cycle too. If you're worried, talk to your doctor. Or just give your body time to adjust.