Is this true about birth control?

I've been trying to go on the pill for quite sometime already but my dad is not having any of it. I'm 17 years old and my dad believes that if i'm on the birth control pill long enough then later on when I want to have children it will be difficult. He says that he has seen instances where couples he knew had children but it took them years. He's convinced that after your body gets used to the pills chemicals inside of you for a long period of time then your fertility sucks or something. I definitely want to have kids in my early twenties but I'm sexually active now and have a horrible, painful, and irregular cycle. Is what my dad says true or is he just getting old and crazy?