Of course you can be just friends w/someone you are attracted to. Taking things to a physical level ALWAYS involves a conscious choice, even when ppl pretend it doesn't. You don't know how to act? Why act at all, just be yourself. This is what being a true friend is all about. You should be able to be completely comfortable w/that other person. No games, no facades. Comfort and communication are the basis of ALL good relationships, friendship and more. Your "friend" is correct. The best relationships always start as strong friendships. Relax and be yourself.