Kissed his best friend

So a new guy recently came to my highschool and at a party I kissed this guy who I didn't like and had no interest in. He was my frist kiss and my friends kept telling me at the party to let him kiss me so I wouldent be a 16 year old loser anymore. So I did it and now I like this guy and small world the guy I kissed is his bestfriend. So I feel like I have ruined all my chances because there is a guy code. I am not sure but is there any advice what to do?