Teeth

So, I've always had a ok brushing schedule. I miss every now and then but hey, who doesn't? Yet I am extremely prone to cavities and my dentist says it's all genetics and there's nothing I can do about it. I and so self conscious about it and I've noticed I have a cavity in almost every tooth and it just makes me so sad and depressed.... I dont want to have fake teeth before I'm 20 or 30... Does anyone else have that problem?