Vaginal dryness?

Hey all.. So I'm 17, and my boyfriend and I have been having sex for about 6 months now. I got on birth control (the pill) about 3 months ago, and since then sex has been a little painful. I've never given birth- but the closest thing I can relate the pain to is the "ring of fire" sensation that mommies describe. Is this due to my BC? Should I pay a visit to my OB?