Thank you, Snax, for that info.
My story is that I took singing lessons for a year (2006). However, just a couple months into it, I hit a roadblock that I just could not seem to overcome. It was a year after I stopped taking the lessons that I was diagnosed with chronic sinusitis (in 2008). And because I'd had it since I was a kid (I just hadn't had it diagnosed until now) I didn't know any different and therefore hadn't even considered that that might be the reason for my roadblock. So my year of singing lessons were almost a complete waste of time. It was like trying to learn to drive on a road that was totally blocked. Pointless.
That song I'm singing there is a Christina Aguilera song, and so is far more advanced than my current singing ability can cope with. I guess it's a case of having ran before I could walk. But I love the song and I just wanted to sing it at the time.
Any more advice (I know I'm being greedy here, lol) would be great. :)