Hello. I’m A 17 Year Old Female And I’m Having

Hello. I’m a 17 year old female and I’m having vaginal issues. Within the last year, my vaginal discharge has really became a constant and persistent problem. I’ve never had any STD’s and there’s no possible chance of having one. I also experience pain during the first few minutes of sexual intercourse. Also, within the past four months I started taking birth control daily. What could be the problem?