Am I infertile? A lot of opinions, please?

okay, so i'm 15 years old. and i'm 5 foot 3, and weigh 196 pounds. but my BMI isn't over 30, it's around 27. I've had my period since I was 10, and it was regular at first, but as soon as I entered high school, it became incredible irregular. I went to the doctor and she tested my thyroid and everything and she said my hormones were at a normal range, and she put me on a birth control pill. I've been looking into PCOS, but i'm overweight with irregular periods, but that's about it. I have acne, but not serious acne, not like women with PCOS. I am a teenager, and I'm stressed all the time. But i am absolutley horrified of being infertile. I want to have kids more than anything, and i've been research irregular periods and overweight and i keep coming across possible infertility :( i'm petrified. can anyone clear my mind and give me an opinion? thank you!