How do I go to the Gyno

I lost my virginity two weeks ago to a guy who has had sex with 6 girls before me. He told me he was a virgin too and I am just now finding out he was not. It burns when I pee and I have discharge. I live with my dad and brothers and there isn’t any women figures in my life. How do I tell my dad I need to go go to the gynecologist. Im only 16 and he doesn’t know I lost my virginity😭 i’m afraid to tell him💔