Your attitude towards yourself is what matters here, not how she feel towards you. The more you think you are unavailable to her, the more she will sense this and not be interested in you. The worst thing that can happen is that she rejects you, but how is that different from your current state? You're not together now, either, so nothing changes in that regard.
There is no such thing as "man enough"; that's a myth. You're are as masculine as you feel and right now you don't feel like you are masculine enough and thus you don't become masculine enough. I'm not saying you should become macho, but what I'm saying is that one's sense of masculinity and how comfortable we feel in it, depends on ourselves. It does take time to build that confidence because you are scared of being seen as a girl, but it's important to remember that masculinity is not necessarily tied to your genitals, but it's tied to how you carry yourself and present yourself. One defining feature of masculinity is confidence and most importantly, everyone is attracted to confident people.
Work on your confidence and you will begin to notice that your masculinity will also come to you as do that, and that people will suddenly find you more interesting and attractive simply because you believe in yourself. Self-esteem matters way more than we think it does, especially when it comes to building interpersonal relationships. Remember that the one person whose relationship you can never escape is actually your relationship with yourself, not other people. Want people to love you? You need to begin to love yourself, too.
