I'm 18m

Okay so im in a relationship. I have a few female friends, my girlfriend is okay with that, she has male friends too. 


But I do find some of them attractive. Now this is definitely not why I'm friends with them. Like I wouldn't ever have sex with them, even if they came on to me. I just recognise that some of them are attractive. 


I feel really guilty about this and I'm wondering should I stop being friends with them? I don't know I'm really panicking and I feel awful. What should I do?