Is it normal that i had sex with two different girls in one day?

I was at school just chillin and a girl walked up to me and asked me to be her boyfriend so I said yah and 2 hours later another girl told me if I would have sex with her and I said yes. We went to a class room that was empry and we had sex it was long and no one found out. After we finished we went to our next class and I saw my girlfriend and she told me to have sex with here at here house so I did and when we finished I felt bad for not telling her, was it normal?