The thing is, you can't really decide how you would feel by examining fantasies or thinking in theory about sex. The reality of it is usually very different A typical example of this is the idea of a three-some in that for most people (or so I have heard) it usually ends up just being awkward instead of amazing. What I am suggesting is that you should wait and see. The more stressed out you are now about it, the harder it will be to decide how you feel. Anything you conclude will feel forced. And you do have plenty of time, right?