Im a straight girl and I've just gone 2nd base with a bisexual female friend who used to have feelings for me. I feel like Im screwed. I dont know what to do :( help a stranger

Hmmm...I'm not sure if I'm the right person to help you. first, maybe you should reflect and think about why you are upset about it. Are you worried that this will change your relationship with your friend? If so, maybe you should openly talk about it with her, with all honesty about how you feel and say sorry if needed. Communication is the key!