No birth control

I am 18, whenever I get drunk I get really horny and can not help myself but to text/ring a boy I know and get them to come to mine.
I never make them wear anything as a condom hurts me and I enjoy getting cumed in. 
But recently my vagina gets really sore after sex.
From halloween I have had sex with 16 men who are all at least five years older. I am trying to be honest to get the best answer.
What is the best birth control? No pill as I would forget.  I live with myself so it is easy to get sex when I want so no comments about family please