One Night Of Mistake

I met a guy at a bar last week and we hit it off. He was attractive and we had this instant connection. We exchanged numbers and I thought maybe he'd ask me out again, but instead he just suggested meeting up that night for drinks. I went back to his place afterward, we got really drunk, and well...I slept with him. I feel so ashamed about it now because I was fine being single before and don't know why I needed someone like this. And what if my friends find out? What do you think I should do?