I have an unbelievably messy situation. Help!

I am 17, female. Me and my best friend have been thinking about having sex (for the first time) and it is very complicated. Firstly, I am not brilliantly confident about my body so the idea of having sex really worries me :/ Secondly, I have loved one of my close friends for a very long time, but he has a girlfriend and I have accepted that I can never be with him. Thirdly, my best friend has had feelings for another of our friends for over 2 years. However we are so close, we talk everyday and tell each other everything honestly and being comfortable with him is one of the main reasons why I would do it. I know his reasons for wanting this, and they aren't to use me. But I feel my own reasons for doing it wouldn't be so genuine: I am scared I won't find anybody before university, to even kiss. I also want to have the horrible akwardness of a first time out of the way before someone I love, which makes me feel guilty. But I do like the idea and I am terrified if I don't take up the offer now, I will regret it. This is so messy, please help me!

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