Well, I listened to "Back Here." The links were dead on the original tunes from your first post.
I don't think your singing was THAT bad. Seriously. The falsetto was a little painful, and you hit some flat notes, but overall it wasn't too bad. The song was kind of lame, but that's just IMHO.
Wanna do the very best thing possible to improve your singing? Take some vocal lessons from a good teacher. Seriously. I took some last year, even for a fairly short time, and they helpeed me SO much. You're not projecting at all while you sing, so it sounds lame and weak. If you learn how to stop holding back, you'll sound 10x better.
Whatever your original tunes sounded like, I am sure they are not great, but very few people shine right away. It takes work and practice. I've been playing guitar for a LONG time, and recording at home for about 3 years. My recording and production, my songwriting, and my performances have gotten SO much better from my first recorded tune, which actually is not too bad. (I had been songwriting for years before too, and I have some DOGS...) Keep doing it and you'll get better.
Like I said, take some vocal lessons. Despite what you think about "magic processors," pretty much all of the "boy bands" can actually sing. I think their music sucks for the most part, but I have heard engineers who actually recorded some of them say that the singing was amazing. They could just harmonize at will and their voices were great. No processor is going to make you sound THAT much better if you sound awful from the start. All of those kids have YEARS of coaching, and it makes a huge difference. You will sing more confidently, and that is the main problem I heard in the singing on the tune I listened to.
And yes, I do want to hear your original stuff, to see how it sounds, after reading everyone ripping you up. If you're curious, you can hear a bunch of my stuff at mp3.com - follow my sig... 🙂 (I'll ALWAYS let people hear my stuff when I am talking about the quality of someone else's.)