Against “The Pill”

I’m 17 (18 in 2 months) have a regular period and I’m sexually active and I’m against birth control because of the weird side effects that come with it. My mom wants me to have it and she kinda doesn’t like to hear why I don’t like birth control she say I “need” it but so far I’ve been doing great with just condoms and the pullout method. What should I do?