Lying about sex

I lost my virginity to my best friend a couple months ago. It was such a dumb mistake and the biggest regret of my life. I feel like such a bad person. How bad would it be to lie to a guy I'm talking to about me losing it? Would it be wrong to basically just tell everyone I'm a virgin. I mean virginity isnt really real anyways its socially constructed but I guess I'd still be lying. But I mean if I'm std negative does it really matter if I've been with someone before?