I don't know if this post will be noticed cause I'm posting a little late in the game, but I definitely understand the fear of sharing your own music. It's something I've dealt with all my life. You invest a huge amount of your soul and ego into what you create, and revealing it anybody is showing off a very intimate part of your being. Then again, from some of your later posts it sounds like you're doing a lot better in this department - props to you!
I already posted a comment on your soundcloud, but in case you haven't seen it yet I'll reiterate - I think it's a great, well-mixed piece and am impressed by the expression and haunting quality of your voice. I think the one critique I might make is that given its simple structure, you should do something different with the guitar or vocals to create a better sense of build. Maybe have the guitar solo improvise for a little bit for one part, vary your riffs a bit more, sing a few wordless long notes while letting the guitar take the foreground, or use a slightly more complex chord structure. Apart from that, I think it's a very strong composition.