My girlfriend and I have been going out for about 4 months but I'm starting to realise that I'm not actually attracted to her. I thought I might have just been nervous about seeing a girl, and that I would loosen up especially once I started drinking at her party. But even then, there was nothing. I think we should break up because I feel like I'm leading her on, she feels for me but I see her only as a friend now. How to I let her go without ruining our friendship???