Are you sure you are not bisexual, but gay, and are just not ready or willing to admit it to yourself? You are awfully young to decide that you are Bi. There is nothing wrong with being gay or Bi, but you could be a little confused at this point in your life, when your hormones are raging in your body, and have a hold on your emotions.
I would hold off on telling your friend about your feelings for now, in my opinion. She may not understand, and you could lose a good friend that just might be there for you when you really need her. Don't read too much into the hugs, and the kiss on the cheek. That sounds like she appreciates having you as a friend, and you don't want to lose that.
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