For A Long Time I Have Gotten Clear Liquid In

For a long time I have gotten clear liquid in my anus. I believe it is sweat but I don't know how to stop it. It never drops and sometimes irritates the skin to the point to where is tears and becomes extremely uncomfortable. I'm 15 year old boy, I haven't had sex, I don't masturbate and I've only kissed one girl but it has been happening before I kissed her. Please respond thank you so much