Do you think it's bad to have sex with your boyfriend a week after you've gotten together?

Okay I am 17, I just had sex with my boyfriend a few days ago.. My boyfriend is actually my friend's brother, so I knew him for quite awhile before we started dating. He was my first time but I wasn't his, afterwards he told me I was the best he's ever been with.(I thought that was uncalled for but whatever)
 I feel really guilty because I promised my brothers I would never do it until I was married but I was so curious and I didn't want my boyfriend calling me a chicken. He's always hugging me and kissing me now, it's weird. I am not sure how you're suppose to react after sex but I've been acting uncomfortable, it's not like it wasn't enjoyable.. I just don't know how I feel. 

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